700R4 TPI transmission Dec 6, 2023 · Introduction; Casting Numbers, Casting Dates and Marks; In-line 6 Cylinder Heads; Small Block Cylinder Heads; Big Block Cylinder Heads Introduction. 186 castings were also used on the 69 Z. 5:1, but this depends on your piston. And I mean LOW. 16@118mph 461 BBC 8:1 compression with junk peanut port heads Nov 7, 2019 · These heads have 2. and not every small valve small block head is junk- the 305 HO heads that end with the numbers 416 flow pretty well for stock heads and the small chambers will bump a 350 with dish pistons up to a respectable compression ratio in the 9. No matter what you buy their will always be something better and someone with a faster car. Both were used between '64-'66 on the 327cid and had 64cc chambers. Jun 18, 2018 · I agree with Vinnie unless your 186 heads can be setup for the $250 that you mentioned. 305 per Alan Colvin. (engine it came from is a 327ci) All I can find on these heads are: 1968-69 302 2. Cylinder Head Bolt Style: Torque to Yield (TTY) Cylinder Head Visually similar to GM casting #3782461, which first appeared on the 1961 Corvette “fuelie” No accessory bolt holes, just like the original heads Aluminum heads shave 40 lbs. 94's that have the correct dates for my '69 Z and when I inquired about installing the 2. Before the boys at bullet cylinder heads in Adelaide they gave it the once over. 3L EcoTec3 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More L82 5. The later 461 or 462 heads would be my choice for a nostalgic look and high performance. -anonymous Corvette restorer Officials indicate development is underway at Trick Flow, and the new alloy versions will feature the traditional closed combustion chamber with an option of 1. Does anyone know the specs of the heads that cam on the 302 ranger in 1969? I would like to know the chamber size and valve sizes. I have a 350 with flat top, 186 double hump heads with the works done to them, rpm air gap intake, 650 double pumper (i also have a 750hp if needed), 3000 stall, 3. 00 for a set of 186 Feulers would be money well spent IMHO. 8 Small Head Zinc Plated; JIS B1189-10. 292's - I'm rebuilding a '70 LT-1 which last ran in 1993. All 3 used the same flat top pistons, same cam, etc. 0:1 compression ratio 76. 525' lift. Of course, camel humps have been popular heads since they were new. same cam ??? Does the L48 use the pink rods ? Does the 69 L46 use the same pistons as a 1970 LT1 ? Aug 30, 2009 · Check out these Chevrolet double-hump cylinder heads and you'll find out why most are the same but NOT equal! Check out the details, modifications, and tests we run on various types of heads, These symbols are helpful, but should not be solely relied upon to determine what type of heads you have or what features they have. a buddy of mine ran dirt track for years & was also a machinist. 45 and 2. There are similar camel hump heads(#186 and #041) on 69-70 300hp 350's, but they have the holes on the ends. There are no screw-in studs or guide plates as there would be for the better factory issued '70 heads. Note: Anyone rebuilding their '68 or '69 186 heads who want to keep their heads appearing stock (press in) but use screw in studs should be aware that machine shops have access to rocker studs that screw in but without the integrated 'nut'. 0-1 CR and the L48 (300 hp 4 bbl) had 186 or 041 heads with 63 cc chambers for a 10. I do have a set of 186 heads that need new Valve seats, but the damage was done due to bad valve guides per my Machinest. 50-inch valves. I think I would be better served with lesser cylinder head and lower cost. I have both sets of heads and went with the E7TE heads. 00, a pair bare with new guides and ported sell for $1800. Nov 7, 2013 · I have a Chevy 350 small block I am building for my 59 apache. Sep 17, 2012 · Some of the 186 heads came outfitted with 2. SB Chevrolet 186cc Aluminum Cylinder Heads. Vortec 062's 406 w/hyd. maybe he told me that they were 64 & 68 . Nov 25, 2001 · These flow #'s were just something I found off the 'net, I don!t know how valid the data is. The 2. Now days you are well off to buy aftermarket heads and run the newer cam Re: FlowBench numbers on various SBC heads 07-03-02 05:16 PM - Post# 113464 In response to Jay727 same as any kind of head , the correct valve job angles/width combinations Nov 15, 2019 · Before 1970, 186 heads had press in studs. cam and stock rocker arms 11. Valves were 2. Information overload! Engine specs are stock bore and pistons with 64 cc 186 heads. 00 Vortec head will out perform those heads by a great margin. 539/. 25-1 They both used cast iron intake and Q-jet carb. I have built a #3932386 block / #3927186 heads (ex Z parts) engine, but modified it a bit). May 7, 2004 · If you currently have a set of 441 or 993 open chamber heads with stock 194/150 valves All I can say is that spending 150. all i could find was 9D18 and i cant seem to find specs on it. 94 or 2. For a cruiser they will work just fine. 0-1. The only drawback to these heads is that they suffer from a little more valve shrouding (see Fig 6-1) than is necessary, and sometimes chamber cracking (details on cracking later in his chapter). 400" Intake / Exhaust. Feb 3, 2004 · NPI cams:. 94/1. 4cfm@. The Camel Backs are often confused with the "fuelie" heads found on fuel-injected Corvettes, but measurements of the intake and exhaust ports will reveal the Camel Backs are installed in the carbureted 302, 327 and 350 engines. 02; so therefore should have the same throat size as a factory 2. 02's I was told that the 1. 8 Square Head Set Screw Bare Steel; Close; Stainless Steel. 100" Intake / Exhaust. 25-1 CR. 02: 1. 02 x 1. It is mainly considered a hi perf head, but was also used on the trucks and fullsize passenger cars. 3L EcoTec3 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More LS and LT Engine Reference Guide for the Gen. Jan 20, 2012 · Specs on the springs are: 125lbs. better flow, better chambers, after modifying the springs you can run a higher lift cam. Don't bother spending any money on them. Cylindrical Thread; Close; Socket Head Fasteners. The '64 & '68 300 hp engines also got these heads. Feb 8, 2004 · If you currently have stock GM heads, I see no point in putting on another set of stock heads except for Vortecs. 700" Intake / Exhaust. However I want a better cam than stock and I just not sure what to choose. 02 and 1. 0-1 L48 was 10. 94" or 2. 7:1. 8 Grade Bare Steel/Zinc Plated; 12. 2016 Lund Tyee GL 186 Boat reviews, 2016 Lund Tyee GL 186 Boat prices, 2016 Lund Tyee GL 186 Boat specs, Lund Boat pictures, 2016 Lund Tyee GL 186 Boat, Boats. 60 valves and made about 465 hp out of a 355 with them. The issue is, it has 292 casting heads, which I thought was only available over the counter, so apparently they're not original, but they're in pretty bad shape. It most cases the heads are not cost effective, they will need major machine work, seats & guides are common. May 5, 2005 · I am looking for a powerband from idle to 4600-5200. Jul 12, 2020 · L-29 461 BBC 11. Feb 2, 2015 · This flow improvement with the heads you have should add 15 to 30 horsepower to your engine. I had a set rebuilt then after rebuilding them i went with the vortec heads. 02 valves, i can't recall. 305 cc 186 heads was a premium fuel engine. IMHO, leave the camel humps for the resto people. Google 375 horsepower 350 combos and copy one. Assembled with 1. E7s are much better in terms of flow. Aftermarket heads are a better value. 54 @ 180. I have 1. The best "production-line" heads Chevy ever had (years ago) were the earlier (Fuelies) 461X's. original 461 iron heads Improved port/chamber shape for better performance and efficiency Standard port location for use with most intake and exhaust manifolds 180cc intake port volume Feb 16, 2011 · Some 68 'over-the-counter' service heads were also produced, but the number was small and the 1969 parts books cross-ref. 2002 Jerry Bickle Cavalier, 446" Small Block, Brodix Canted Valve, lenco 5 speed, 7. the 461 might be a 58cc & the others 64cc. DIN 931-A2/A4 / ISO 4014 Hex Head Cap Screw Part Thread; DIN 933-A2/A4 / ISO 4017 Hex Head Cap Screw Full Thread; Socket Head Products. Number Year Engine Valves Details; 10033867 : Over the counter Pontiac 23' head, 62cc, angle plug, 196cc intake port, aluminum: 10045434 : 55cc, angle plug, raised Jan 20, 2005 · Grasmo is correct. 1969-70 302, 350, camel hump, has accessory holes, 64cc chambers cylinder heads part# 3927186 original and rebuilt date- K-12-8/ A-16-0 Dec 10, 2006 · Is anyone runnig this camshaft? I called comp cams and talked to them about my combo, they recommended this cam and to run it 4 degrees advanced for better low end. It also is alluded to have either 1. 550. Bullet heads service recently got a factory blue twelve port cylinder head to flow 187. 94 version of the 186 head had the same throat size as a 2. 02 1. 5", not 2. 50 inch valves. The 461x heads though desirable for their bigger ports are basically all gone, used up and expensive. For a street car, this design means excellent throttle response, torque and average power. 8 rockers. 5 LS/LT, Vortec/EcoTec3 Engines Apr 8, 2015 · wanted input on how well a 383 may be expected to run with some 186 Z28 heads I have laying around, they are 202/160 and have had bowls blended and chambers unshrouded. 50 valve size. Mar 20, 2010 · From the early 60's until the late 70's they were called Super Port-Flow heads, and were kind of like the "state of the art" for their day. The block is . 94 heads have smaller runners than the 2. The heads come with 5/16-inch guide plates and 3/8-inch rocker arm studs. Sep 24, 2002 · I do know there is one 283 head that has combustion chamber shape of the 186, 291 and 462 head, but I can't remember the casting number. 041 or 186, so the difference in compression must be in the piston. Aug 12, 2017 · In the early days, the iron heads were taken off for aftermarket aluminum heads, and it was real easy to find 461 heads at the swap meets. If they are the low hp version of 186 heads (impala, corvette, etc)then they may have the 194/150 valves and would be hard pressed to exceed 300hp without head work. I Bowtie, 206/77cc ports, large port head: 33417369: 71-72: 350: Mar 2, 2013 · Good heads for the 360 or 390 truck. 6 valve version, so you really need to look at the valves to see which one you have. Sep 12, 2019 · They are '70 small valve heads commonly referred to as "300 HP" heads. But I used them with a good piston to build compression and 2. As already referred to, they are highly prone to cracking in critical places, and do not take kindly to port work as a result; their combustion chambers are a cavernous 76cc, and leave you with a compression ratio way short of anything resembling performance; and their flow. The 186 heads are very rare as they are some of the last closed chamber heads with the highly sought after accessory holes on the ends. 63) and later, post 70 books, showing several other present production numbers. Mar 31, 2001 · Hey guys - This old man needs your tech brains on my Cam SPRINGS. Find World Products S/R Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! World Products S/R cylinder heads make it easy to rebuild your engine affordably. casting # chamber vol. 90 posi. I'm rebuilding a 1969 DZ (Z28) 302 to as close to factory specs as I can including date codes. Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Dec 23, 2017 · Due to the valve size, Trick Flow recommends a minimum bore size of 4. 50 valve . they are the preferred head to use out of the factory open chambered small block heads Choosing a cylinder head for your small-block can be a challenging task because of the shear number of heads available. Nov 23, 2004 · A friend of a friend is selling his car and is also trying to get rid of heads with casting-# 3927186. 300" Intake / Exhaust. The 1969-70 350/300 with it's 10. The intake ports are just about 2 ¾” tall and 1 ¾” wide. Thats to much for a mild cam and pump gas. Feb 2, 2015 · The main differences were heads, intake, and carb. off the nose of your car vs. 530" 194 exhaust 1. 062 Vortec Heads: A Head-To-Head May 30, 2016 · C3 Tech/Performance - Head tech info: 186 small to large valves - Happy Memorial Day! I imagine this question has already been answered but my search has not found previous post so here it is again. Jan 5, 2016 · 441 heads are good flowing heads. Sep 1, 2009 · The 461 heads for the 327 and the 186 heads for the 302 were given the same treatment, basically bringing them up to factory fresh condition (but no porting of any kind or any special valve job). They were only availiable with the 1. Exhaust Valve Diameter: 1. 041/186 heads - The advertisements for Vortec heads cite a 30hp increae over stock heads. Im not real big on that cam either. 4. Sep 24, 2015 · Cathedral port cylinder heads have been mistakenly dismissed by many in LS-series circles for being “old-tech. 60 exhaust valves in them. May 5, 2003 · E6SE heads are not worth the time. Head History. Cylinder Head Flow Data At 28" H2O Chevy Manufacturer /Part Number Port/Vol Intake / Exhaust Valve Size Intake / Exhaust Combust. ALL 1969 "186" heads had pressed in studs and no guide plates originally. 60, hardened seats, pocket ported, and port matched by Flow Technology some 16+ years ago ($150 back then) and the other day the car did 293 hp and 293 ft-lb at the wheels on the dyno. 041" heads were also used on 69 350/300HP full size Canadian Pontiacs, but they had the 1. they are a different size. Jan 27, 2003 · The 041 heads are the same as the 186 and 187 heads except it has a right triangle casting symbol vice the camel hump. The runners have the same volumes of 161cc intake and 65cc exhaust as the listed 186 Fuelie heads. Standard Gen-I small-block Chevy heads position the valves at a 23-degree angle to the deck. 6 1970-72 350 2. does that mean anything?? thanks Aug 4, 2001 · The "041" head was a 1969-1970 high performance head, with the same exact performance characteristics as both the "186" and "187" Camel (double) Hump heads. i had a set of 441's that were 1972 models and they had 1. Heads can be ordered bare with inserts fitted or assembled with quality 21-4N stainless valves, double valve springs and chrome moly retainers. 000-inch. The flow numbers on 882s are not much less than small valve hump heads. 60 exhaust valves. to 3927-185/186/187 (dependant on valve sizing and the 185's had a @70cc chamber vs. ). Valve seat recession is usually a result of high RPM, High heat/load. 02 heads have a machined combustion chamber around the intake valve for unshrouding. Boating Ontario’s Historic Canals Flying Over Water with Hydrofoils Nov 15, 2006 · All Original 2. The rest of the Bronco specs are: 3 sp manual Dana 20 TC Dana 30 front axle 9" rear end 3. 94 intake/1. If both heads are 1. For what you say you want to use it for, I wouldn't spend any money on getting vortecs if you HAVE 186's and the compression ratio is pump gas friendly. Is that true? I thought the only differnce besides the valve size was the unshrouding of the valve? Dec 2, 2010 · I had the L79 cam in 1969 Vette with flat top pistions and stock 186 heads. 02 valves, and I think that was the only head that came that way originally of the 492-186-291-041 heads. I know everyone uses something different, but based on direct measurements this works out. More tech info. 02/1. They are supposed to be for an untouched 461 head with 1. a typical Street Machine will not encounter those conditions. Feb 3, 2015 · The 1969 350/255 with it's 9. Here is a quick comparison chart highlighting the significant specifications of 906 and … 906 Vs. i seen him angle mill a 461 & a 186 & ran them on the same engine. 390-inch intake/exhaust valves. com. 02" intake valves and was a 327 only head from 62-68 except for the 302 in the 67 Camaro Z28. The most basic aftermarket head or even the 300. 370" heads were used on 300HP canadian full size chev cars, and have the double hump end casting designator same as the 186" Nov 2, 1998 · The 462 was available with either 1. While 906 and 062 Vortec Heads share some similarities, there are also some notable differences. For the price of a set of 186's, you could buy some real nice aftermarket heads. Jan 29, 2012 · Actually, 492 straight plug heads were used in late production 1970, part number 3987376, this was also the superceded part number for the discontinued "186" 1969 Z28 head. The "standard" 461 head's intake port volume was 161cc, exhaust was 62cc. The 186 was the first large valve/64cc chamber head with accessory bolt holes. 186's are very reliable and have decent flow with flat top pistons in a 350. They were used from '68 through '72 on 302 CI Z-28 engines as well as '70 through '72 in LT-1 350 CI Corvette/Z-28 engines. We have a good supply of used ‘186 & ‘492 heads available with everything from “Undercover Porting” to CNC Sportsman Porting. Later we offered the FireBall heads for small-block Chevys and Fords. The 492 was only offered as an over the counter/warranty head, never came on a car but they probably have the acc bolt holes too. 02' intake, 1. Deviations would result from machining/resurfacing which would reduce volume, valve sinking, which would increase volume, etc. 60 valves. In 1989, Chevy introduced the 18-degree Bow Tie aluminum head that shifted the valve-angle vertically, while simultaneously raising the intake port to take advantage of this angle. Dyno tests have proven that comparable aftermarket cathedral port heads […] Dec 19, 2021 · Its going back a bit, but some versions of the Iron Killer heads. The 492, 292, and 186 heads have a slightly different looking camel hump. 3, Gen. Oct 21, 2009 · I believe the Z28s could have either the 291 (68) or 186 (69). Combustion chamber CC is listed as 62. It will be a daily driver for the street. 94 valves and unported probable only 20 to 30 hp difference. Sep 29, 2005 · I know they both used the same heads. /1. They also came in the 2. The heads will work with 1. I'd say you're going to jump your compression 1. I upgraded the heads first to 185cc Bowtie Vortecs a few years ago. 50 valves. 5 compression. However,these AFR heads are so good that I am probably leaving 70-100 potential HP on the table due to my mild cam and mild compression ratio. Neither had accessory holes. 60 valves on these older "64"cc chamber heads without any milling? Feb 22, 2018 · I was in my mid 20's and had tried many casting number heads 186, 041, 624, 882, 993, 441X, 461 the only difference i could tell is when i used a smaller chamber. 400 lift in 28" water. 50 valves - screw in studs/guide plates and machined for positive stem seals mild cleanup and gasket matched to EDELBROCK PERFORMER 2101 MANIFOLD, center divider wall machined down 1/2” 041's are a 1. If the budget means early-style heads (as opposed to the later Vortec heads) then closed chamber heads are definitely the ones to look for. The L65 (250 hp 2 bbl) and LM1 (255 hp 4 bbl) 441 heads had 76 cc chambers for a 9. Maybe some of the 492 heads had 2. 9 Grade Bare Steel/Zinc Plated; 12. The heads on my SS-350 are 186's and yes, they're double humpers with accessory bosses. Info from Chevrolet specifications and backed up by Alan Colvin's Chevrolet by the Numbers 1965-69 and 1970-75 editions. Second rule is a cam doesn't do much more than to shift where in the RPM operating band that the engines makes it's power. 9 Grade Bare Steel FINE Thread; A2/A4 Stainless Steel Mar 1, 2010 · Judged on specs alone, the drop in cam timing was pretty significant. We have a great online selection at the lowest prices with Fast & Free shipping on many items!. Hell, vortec heads and a comp XE will get you 400 hp. Chevy only installed these heads on their high-output performance engines. 030 over, align-honed, stock heads rebuilt, squared and decked for exact CR specs, etc. intake valve exhaust valve; 032: 70cc: 1. You just have to calculate the amount to make them usable. 5 and 2. Early production 70 Z28,s/Corvettes had "186" heads before the "492" was used. Both were excellent OEM heads. They came on the 302 motor as well as the 350. May 12, 2023 · The 906 and 062 Vortec heads are two popular cylinder head options used in small-block Chevy engines. sorry but i dont have cam specs right now (lost them) its just big enugh i need a stall converter but not huge. Valves are 203x156 like all the vanilla heads. 50" exhaust valve. If you use these heads in place of a camel hump head it will lower the compression due to these have a larger combustion chamber. mph,1. Jun 27, 2010 · Remember that the '461X heads were used in 1961, 1962 and 1963 with valve sizes 1. Since the mid- 1980s and the introduction of factory designed Bow Tie heads, Pontiacdesigned small-block heads, and numerous performance aftermarket heads, picking the right head has become more or less a matter of choosing the best casting for your specific application. May 30, 2006 · Not knowing the exact specs on your 383 its hard to be accurate but most 383s with flat top pistons will be around 10. 466" 186 intake. 6 I would say, looking at the 2. The heads on my engine Jun 7, 2004 · i got three sets and they are all from trucks, they make decent torque power but they suck still. 02/1 Jun 24, 2013 · C3 Tech/Performance - 041 SB heads vs. When using 64cc heads,,,, Flat top 327 is about 9. 600" Intake / Exhaust. from what i can find out, these were also the same number as 327s and 350s. Jun 28, 2010 · There is no discernible difference between a 291 and a 462 head. 5:1 compression Flat top 350 is about 10:1 dished 350 is about 9:1 Sep 23, 2006 · Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. I hope this helps. 94" intake and 1. 10@118mph 9-30-22 10. you can look & see the difference. JIS B1180-8. 94 intake and 1. over stock LT1 492 heads ! I like old school builds :thumbup: The 492 and 186 new castings complete and ported are selling for $2500. Many classes of dirt track racing are restricted to these large chamber heads and the racers are looking for this casting number specifically. L46 was 11. And the 113 castings have a revised exh port shape than the 083s so that explains the exh flow difference. 50 exhaust while the bottom head is the performance version (325hp and higher) used on 67-68 327 applications with 2. 60 186 heads I would like to sell. Feb 10, 2012 · 461 heads I have had a few 461 castings, I prefer the 462 and the 186. 8. They feature hardened steel exhaust seats compatible with unleaded gasoline, extra-thick decks and walls for improved reliability, tapped for screw-in rocker studs, and machined valve cover rails to eliminate leaks These heads will also interchange with camel hump heads with casting numbers 370, 461, 461X, 462, 291, 292, 186, 041, & 492. ! Aug 24, 2004 · None of my literature shows the 186 as a fuelie head, but only as a 69,70 302 and 350 head with 63cc combustion chambers. Go back and read the other threads you started. Dec 8, 2005 · Case in point: GM's ZZ383 crate engine with one of the best production type 23 degree heads the General has, the fast burn 210cc port ones & a pretty fair hyd roller. Longer than stock pushrods are required. Oct 10, 2014 · The 186's (2. 50 only. That had 11:1 compression, a solid lifter cam, etc. On my dyno this engine was 434HP & 450lb ft. 50 or 2. 02 stainless intake and new 1. The heads were used on Corvettes, Chevelles, and other special applications. Nov 29, 2003 · The 624 heads are among the worst of the worst. 50 for low horse applications or 2. The term "fuelie" was used for the early 461 and 461x head, because it was first used on the fuel injected 327 Corvette engine, thus people began to call all old double hump heads "fuelies" Tank Head Specifications (In addition to tank heads, we fabricate Segmented Domes with virtually no size limitations. Oct 17, 2021 · My understanding is the 492 head was a direct over the counter replacement for the 186 2. 74 exhaust. These were serious race heads, made from ported and polished, new Chevy 461 and later, Turbo 292 castings. The 1962–1963 221-ci cylinder head is easily identified by its very small kidney bean–shaped 45- to 51-cc combustion chambers along with 1. and they are cheap compare to other aftermarket heads. Most of the fuelie type heads,(461, 462, 291, 186, 041, 492), were functionally the same. Stock “double hump” heads flow 202 cfm intake and 141 cfm on the exhaust. The heads have 64cc combustion chambers with new 2. figures out about to be about 9. Get the best deals for sbc 186 heads at eBay. Decide if you're building for power or looks. As much as we all love the Z/28, by todays standards the 186 heads are low performance. With the cam headers and 4bbl it will run very good. These heads are easily identified by the last three digits of the casting number: 461, 462, 186, 291 and 492. 60 stainless exhaust valves. The c1ae-a head is indeed the 390/330 Police Interceptor head, it was nothing special. Are the they referring to the smog heads on my '80? How do Vortec heads compare to the double hump 186's or the 041's (with 194 intake) that I have now. Factory original big valve heads are worth more than these. DIN 912 / ISO 4762 Socket Head Cap Screws. That is the benefit of aftermarket heads. 2. 6 valves, just depended upon which vehicle GM put them in. The revised 461 heads were available starting in 1964 models with either 1. General Recommendations for AFR Cylinder Heads: Bar Codes - Please keep the bar code & paperwork shipped with your head, these contain all the specs for your heads when calling AFR. 5:1 or 1. High Volume/Pressure Oil Pumps - If you are using a high volume or high pressure oil pump it can submerge the valve seals in oil causing smoking or oil consumption Jan 2, 2006 · The aluminum L98 heads (113 casting) are equal to the iron L98 heads on the int, and much better on the exh side, and slightly better than the 193 exh as well. They have bigger valves , smaller chambers and flow more air. DIN 479-8. Check out the head porting section, if you haven't already. 900" Intake / Exhaust 1. Jan 21, 2023 · I have yet to need hardened seats in any of my Small Blocks. Jun 29, 2010 · On a set of 492, 186, 462 heads what is the typical combustion chamber size after deshrouding 2. I could be wrong on that. 02 / 1,60 heads have been markedly upgraded. 165 in. Jan 20, 2004 · The 186 heads were 165cc runners with 64cc chambers and have 202/160 valves if they are from a 302 motor. but the cost of the new vortec style intake could The pressure differential that a head is flowed at dramatically affects the results. 02 intake/1. i'm currently running a pair of 186 heads but i was curious as to the result of the head swapor any other head swaps you guys can think of Sep 3, 2018 · Larger valves increase the ability of a head to breath, but not as much as the effect of the port design (consider the nail head Buick, or a BBC that has tiny valves compared to a SBC). 466" 194 exhaust PI cams:. Note that with the 186 heads producing intake flow numbers over 265 takes you to the tiping point where you will start to drop off some of the lower lift flow range numbers, but the added port area and volume will help the motor hang on to its peak HP higher in Jan 1, 2023 · Not surprisingly, our search revealed that the classic 461, 462, 186, 291, and 041 heads are now very difficult to locate in volume. 72: 1. 50: 034: 64cc: 2. Feb 28, 2018 · L84 5. 9 - 2012: Clipped Head Plow Bolts [Table 5] (A307, F468, F593, SAE J 429) 18 [DIN] DIN 25193 - 2003: Mushroom Head Anchor Screws With Metric ISO Thread - Class C: 19 Jun 27, 2007 · what would happen if i threw some 400 heads on a mild 350. Hex Head Products. so it would appear to be press in but would be screw in Nov 2, 2017 · LS3 Cylinder Head Specs; Casting Number: 821: Material: Aluminum: Combustion Chamber Volume: 68cc: Intake Port Shape: Rectangle: Intake Runner Volume: 257cc: Exhaust Port Shape: D-Port: Exhaust Runner Volume: 87cc: Intake Valve Diameter: 2. ) We offer our products in the following materials: Carbon Steel: SA36, SA516-70, SA387 Grade 5 Class 2 (Forming Only), SA285 Grade C (Forming Only) Dec 7, 2009 · The 461's were installed across the board from 250 hp to 375 hp on '65 327's. Class racers had used up most of them. I am curious if the early date (for Z28) adds value, and what is the Kama KM186FA/E (418 cc, 10. The top head is the 'lower horsepower' version (300hp and under) used on 67-68 327 applications with 1. when i took of the valve cover to adjust the valve i looked for a casting number to look up. 60 Jul 8, 2012 · the vortec heads will have casting numbers that end in 906 or 062. ” However, their thin cross-section allows for a high-velocity and smaller-volume runner design with excellent flow. Where the L46 featured the small-chamber, big-valve fuelie heads (186 casting numbers), the L82 came with large-chamber Dec 12, 2018 · Small-Block Chevy Gen-I Cylinder Heads. 020" 4 valve relief flat top pistons CHEV FUELIE 186 HEADS - 64cc - 1. But for sure they had to have 2. 5 to 1 with a 64cc head. 510" 186 intake. Apr 13, 2015 · The first small-block with a 4-inch bore came in the 1962 Corvette 327ci, and it really opened eyes. I had 0,028" gaskets, and think the compression ratio was 9. Feb 8, 2009 · Those heads (882) will make the power your after but they are junk, anytime you have a head that the heat cross over gets into both exhaust ports it not a good ideal, the 441 head would be a better choice. This is what I have been able to find on these heads so far from a David Vizard publication (the flow #'s are based on a series of mods to the heads); I was hoping to find a more complete set of numbers for a 186 head that had been similarly modified. 500", the intake's hold there, the exhaust's go slightly higher and flow about 145 @ . Date of G 31 7 is July 31, 1967 and H 4 7 is August 4, 1967. 590/1. now that equals 261hp flywheel horse power. -----69 Camaro Z28 "clone" - 327 AT "461" camel back heads, edelbrock, hooker, ultradyne, TRW etc. 02" 186's were used on '69 302's; screw-in studs and guide plates were used on 186's starting with the LT-1 in 1970, in both Z/28's and Corvettes. May 19, 2010 · The exh can be made to go over 200 cfm but it take alot of hard to come by detail work in conjuction with the needed valve job specs. Jun 7, 2006 · The 882 heads are smog heads from '74 to '80 and not very well regarded, but neither are stock '85 heads - if you can find out more about the 882's they may be better than your stock '85 heads - ie not only polished & ported but if milled so they will give higher compression and if valves were changed to 2. It also is a 64 cc combustion chamber. 1. " Chevrolet Small Block Heads – Casting Numbers and Specifications. Common casting numbers are #461, #462 and #291. 590 in. 6 1968-69 327 2. 200" Intake / Exhaust. If you want a good running car with good STREET manners on the cheap use them. 500" Intake / Exhaust. 60" exhaust valves, whereas most 461 heads came with a 1. Nov 21, 2003 · With pocket porting and port matching, they're still a damn good head. 9 Small Head Hex Flange Zinc Plated; DIN 910 Hexagon Head Pipe Plug. Will be running a Holley 650 carb. Mar 10, 2009 · I have a set of these heads, I was told they are off a 67 302 DZ car, said they were 202 valve fuelie heads. 50s that have been hogged out to 2. 60". weren't what I'd call killer Line out your top 5 requirements for the engine, along with your carb/intake, flat tappet or roller cam, rear gear, tire height, trans (ratios too if its a stick), Tq converter, vehicle/vehicle weight. 72/1. Aug 18, 2011 · I have a set of January 1970 date matched 2. 95 litres in cap Jan 11, 2012 · If those don't seem to work, then I'll modify the assumptions. The bowl ported 291 heads on Stan's page is fairly typical, and yes, they were that bad. 5:1 to 10:1 range, which is doable on pump gas as long as the cam doesn't build too much Mar 23, 2008 · honestly i don't remember where i seen or heard that. Oct 1, 2008 · In there day, they were the best available until the 292 angle plug head came available. 6, these heads should flow good. I know 67 and 68 camel hump heads for 275 hp 327 are the same, appearance-wise, having no accessory holes. However, even with a 4" wide chamber and large valves, these heads will still fit on a . 60 for the Z28 and Corvette 350/350hp. Can be made to flow with lots of work. 030" over = 306 ci (but I still call it a 302). Even if you have to spend a little more to get good springs installed. I know 383s like larger intake runners and these would need better springs for 234/242 . 040" over 283 engine, as well as the larger 327 Chevy. 06 60', 2235 lbs for 2014. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. 800" Intake / Exhaust. 221/260. It was available from the factor with both 1. Before the advent of the Sportsman II heads around the late 1980's the 993 was used by John Lingenfelter and other engine builders extensively for street/strip engines. well, they're part of the Feb 2, 2003 · Yup, the 041 and 186 heads were used on many other Chevrolet applications as well, in both valve sizes, but only 2. The valves here are 1. Feb 13, 2015 · The hottest 350 back in the day with those heads (or 186 heads, same thing) was the 1970 LT-1 which was rated at 370 GROSS HP. My guess that these are 2. For all practical purposes and interpretations the camel hump/fuelie head is a 64 cc head. 0 HP) general-purpose diesel engine specs: review, oil type and capacity, fuel capacity, horsepower and torque. Flows about 182 cfm intake and 125 exhaust that makes the ratio about 68% of each other, this is measured at . 00 spark plug cooling holes are plugged in both. Really great flowing head for heavy street machine with agressive long duration mech lifter cams. DIN 912-A2/A4 / ISO 4762 Socket Cap Screw; DIN 7984-A2 Low Head Socket Cap Screw; DIN 7991-A2/A4 / ISO 10642 Flat Head May 9, 2008 · 487x heads flow the best out of all the big chamber medium valve heads (1. 076 for all three heads you mention except for the early '67 heads which spec at 63. Sep 10, 2009 · Re: Runner volume chart for vintage SBC heads? Old Chevy High article? "461" heads were cast with either 3782461 or 3782461X. 550 lift, in a perfect world it works out to be 289 hp. 02 intake and 1. The Chevy Big Block’s Performance Heads have very large Intake runners with rectangular-shaped ports. These are all "nominal" numbers on unported heads. 2cfm @ . The 461 head had no chamber below the spark plug, it was machined flat when the head was made. Find many great new & used options and get the best deals for SBC Single # 186 Double Hump Chevrolet # 3927186 Chevy Cylinder Head Core at the best online prices at eBay! Free shipping for many products! Aug 17, 2015 · 3927186 or "186" Z28 Heads, but you'll need to have them drilled for the 400 block "steam holes" 70-454 LS5 Mid America Chevelle Club #293 Greater Kansas City. The earliest 265 and 283 small-blocks relied on an iron Power Pack head that featured 58-cc chambers and tiny 1. If they had the same chamber size I felt No HP difference. Oct 19, 2010 · The heads you have (double hump 186 casting) should be good for around 350-400 horsepower with good valves, springs and a little massaging around the bowls and the sides of the runners. Dec 5, 2008 · Stock 69 300hp 350 Specs. Oct 1, 2006 · 462 and 186 (double hump)-These castings have specifications similar to the 492 head. They are D chamber also. Good factory pieces but not any Z/28, not 350/350, and not LT-1. The three different engine designs used in first generation Camaros all required different cylinder heads: the in-line six-cylinder (L6), the small block V8 (SBC), and the big block V8 (BBC). 50) these are highly sought after and would give you a small performance boost over your 624 or 882 heads. 6:1 rocker arms. 94 X 1. The advantage of the valve angle 1966 Oval port head; notice tapped bosses for spark plug shields. 02 valves. 65@125mph 406 with home ported Dart 215 heads. 60' exhaust. GM says 425HP & 460lb ft. 67cc combustion chambers. Enough to feel a difference but not enough to buy 100 octane Sep 3, 2004 · personally i would stick with the 441's, because like was mentioned 40 hrs worth of port work on 267/305 heads would cost a buttload of money if you can't do it yourself. 02 etc they will be better than what you have now. 02 X 1. 02 heads. Beware of companies flowing heads at anything less than 28" of water, because that is not a valid comparison with Edelbrock heads. The selection list is basically rather thin for today’s performance engines. The Holden straight-six motor is a series of straight-six engines that were produced by General Motors Holden at their Port Melbourne plant between 1948 and 1986. Just remove the thermactor bump in the roof of the exhaust ports and you gain more flow. The 993 is a 'heavy' casting 76cc chamber head that is actually not bad for performance work. 20 open 1. cast iron Vortec head, Gen. 1 to 9-9. 558 hyd Roller cam I have in the 383 thoughts- opinions wanted. The previously modified blue motor commodore head flowed 169. When matched side-by-side, the DHC head will have a taller profile than its factory counterpart. Jun 9, 2014 · For example, AFR 195 Eliminator heads are excellent pieces, expensive, and would easily help make 430 HP and 430 FT LBS. All Edelbrock cylinder heads are flowed at 28" of water, which more closely represents what an engine will see. My best performance was with 034. These were 2. $400 for everything, the heads, the roller tip rockers, and the hardened pushrods. Jan 28, 2009 · The 305 heads are alot better than what you have. 60 valves, depending on application. When the EH was launched in August 1963, it was powered by two versions of a completely new 6-cylinder engine, the '149' and '179' (named after their cubic inch sizes). I have two sets of 034 left and they work very good on 383's. Mar 25, 2012 · 1969 dated "186" castings were either 1. Sep 23, 2006 · Basically same head as the 186. 427 and 428cj used different heads. For instance, the camel hump symbol (also called double hump) can be found on 461, 461X, 462, and 291 casting heads. 4 & Gen. Nov 30, 2007 · 186 and all other camel hump heads are 64cc head. 33 cc 441 heads was a regular fuel engine. The heads made a an improvement in top end, but probably not worth the cost of a head swap. 020" valves) flow 220/142 @ . All of these heads, with the exception of the 186 casting T-head bolts with large head: 15 [DIN] DIN 188 - 1987: T-head Bolts with Double Nibs: 16 [DIN] DIN 1445 - 2011: Clevis Pins with Head and Threaded Portion: 17 [DIN] DIN 261 - 2010: T-head bolts with hole: 18 [DIN] DIN 25192 - 1978: T-Head Bolts (Hammer Head Bolts) For Railway Vehicles: 19 [DIN] Mar 16, 2006 · C3 Tech/Performance - Vortec vs. . 600". Aug 14, 2017 · march 2014 REBUILT ENGINE SPECS. I would guess 60 Clevis pins with head and stud end: 16 [DIN] DIN 25192 - 1978: T-Head Bolts (Hammer Head Bolts) For Railway Vehicles: 17 [ASME] ASME B 18. 50" valve 64cc head from the 1969 295hp 350 and the 1970 300hp 350,, same engine as none of the actual specs changed. Yella Terra Alloy head to suit the Holden Blue, Black and Red, 179, 186, 202 V6 Motors. how do i find out for sure, short of pulling them apart? there was a plate under the casting number, looks like it says F 1 7. If prepared the same, they will all give the same flow result + or - a few cfm. Chamber Volume. Featuring the famous double hump marking on the ends of the heads, the #3782461 and #3782461X heads used 1. However, 062 has slightly larger valves than 906 Vortec Heads. 02" intake and 1. The heads are better than low power crate engine heads. 25:1 compression ratio 63. Big valve 186's are the typical head used in '69 for Z Mar 31, 2006 · I see some specs on the 186 head: 161cc intake port volume and 65 on exhaust with 64 cc stock chamber. 50 gears I think 235/75R-15 tires As for the rebuild I am going to have the block hot-tanked, magafluxed, , bored . 50 exhaust valves or 2. 15" bind height. The initial Grey motor was so dubbed because of the colour of the cylinder block, later motors came in the form of a Red, Blue, Black, and the four-cylinder Starfire engine. 94"/1. c7ae-a came on 352, 390, 410, 428 in 67 c8ae-h came on 360, 390, 428 in 68-71. The 186 is one of the best closed chamber cylinder heads of the late 60’s early 70’s. 02, then this is a moot point. 02 186, correct? - If the 1. 02"/1. Jul 9, 2010 · I found a pair of 186 heads with 1. 75" seat, 325lbs. 02 intake Most of these heads had accessory bolt holes and were identified with casting numbers ending in 186 or 492. Camaro, Corvette even Stovebolts can be found here. This part number is for the LOW compression BARE head which is intended for Turbo or supercharger applications. 25' OD springs for hydraulic flat tappet cams up to . Shipping for the heads in two separate boxes will be $40 each, or $80, and I will ship the rockers and pushrods for free. Sep 17, 2007 · C3 Tech/Performance - Opinions needed on Chev 041 heads - I know a few guys here are running the 041 heads. 10 sec. qscvwjajgdomjeulybknejsxfkzzzewvmxkykrhdiktagyyoqlpzwhh