Mortec bbc head casting numbers.

Mortec bbc head casting numbers The guy told me it was an LS6 and upon my research to verify, some questions came up. 19/1. Apr 23, 2011 · i have found some heads with 236 castings are tjese good heads for a street head or should i stick with some 781 the 236 heads are 100 bucks May 3, 2018 · How do I identify my engine cast number? There are many existing pages to identify your engine. This has a set of 074 GM aluminum heads ,GM aluminum Hi Rise intake and Original Motion valve covers on it. Chevy V8 Casting Number Locations Chevy V8 SBC Block and Head Casting Numbers Chevy V8 BBC Block and Head Casting Numbers Chevy V8 "W" Motor 348-409 Casting Numbers Chevy V8 Crankshaft Casting Numbers Chevy V8 Crankshaft Journal Sizes Chevy V8 Bore and Stroke List Chevy V8 Notes SBC Crate Motors BBC Crate Motors SBC Cylinder Heads Holley Carb Dec 8, 2001 · the casting number off of my 454 bbc heads is 336781. The heads were crudely CC-ed at 108-113cc's. 500" lift compared to Jun 20, 2023 · I have looked all over for my casting number online at various websites it is not listed. Sorry for any confusion. So, I'm thinking that the 241's are correct, but still trying to find out if the 292's were also used in the same applications. 512,289,959,445 are good. Dec 5, 2005 · Casting # 14015445 Heads# 3964291 but looking it up on Mortec, the casting number reads: 14015445 Then the VIN trailing numbers The casting is for a 78-90 454 Nov 27, 2008 · Basicaly, you end up with a max raised port, thats about the same size, or a hair bigger, than a fully ported oval port head, but the port layout is much better. Both heads can feed a 600 + hp bbc . Just getting around to it. May 10, 2024 · About Mortec and Community News i have a big block chevy casting numbers 61959 can. I found on X on the bottom of the head, but wasn't sure if that's the correct place to look. Menu. 5 bowl port and 3 angle valve job? ===== the only 1. they wouldn't be stock OEM numbers National Corvette Restorers Society Oklahoma Chapter. Please see the attachment below for a list of cylinder block casting numbers used on Chevy big block engines. Is anybody using a set of these or have some information? I looked at Mortec. May 2, 2017 · I received a set of 781 casting BBC heads on a trade and after doing some research, guys have been pumping out solid 700HP numbers. 72 with a HP rating of 325-400 on a 396 to 427 engine. Well actually have II 7115 cranks but ones in a 1969 L-88 512 4 bolt casting CE9 short block,original rods and pistons. nastyz28. Username Post: BBC 3904390 heads (Topic#342771); MikeB Ultra Senior Member Posts: 10073 Loc: Plano, TX Reg: 08-28-03 Mar 7, 2013 · Seems this Casting Number is 'mysterious', a number of guys are looking around for info on it. Any information would be extremely helpful. Intake manifolds are different as are push rod lengths. 25534322 - LS1 Crate engine - Gen. Recently took a Mark IV Bowtie block and a set of heads in trade. 1965 C10 with 498 BBC AFR Heads Jan 28, 2008 · The blob is garbled metal not a paint run, like there was nothing in that space. 500"/. Sep 3, 2005 · I have a set of heads, casting number 3917219. Did they make any 1970 820 heads? What is the difference between 290 heads and 820 heads? Apr 17, 2010 · I would tell you to go to the Mortec web site and compare the casting numbers for your cylinder head of your choice and size of chambers. Plan on using speed pro 38 cc pistons to make 13. with a rect port gm aluminum intake casting number 3933198 date code 1 4 68 on the bottom also stamped 19 on the bottom . Now I have a set of 3964291 Heads, They are Rectangular port Closed Chambered Heads and have a 109 CC, 2. You can compare the flow and ask a good head shop what you can do to get what you are after. Thanks in advance Oct 11, 2017 · Here is a link to big block chevy heads with casting numbers and cc data. I've tried to find some information about these heads, valve size, chamber size etc. The info I've read is the F0208D is a 58-60 motor and the 3789935 is a 61 to 64 motor number. 00 into a set of iron heads like these and have a set of brand new heads with quality parts that will flow 320+cfm and support easy 650hp and you're still a long way from a properly assembled set of decent alum. Post: BBC block casting number 361959 (Topic#228757) BBC-454 Senior Member Posts: 1400 Loc: Edmonton, Alberta Reg: 05-11-03. 88-inch valve combination (depending on Dec 11, 2005 · C3 General - Block casting numbers and dates - Is there a way to determine casting dates of 427 BBC 3935439 - 427 3955270 - 427 3963512*-427 late production Block Codes A-January B-February C-March Etc. 8xx intakes and 1. From the latest information, looks like a correct code string to me for the application. 336768 1973-76 427t Open . 1966 396 block casting number 3855961. 88 Valves. That is a ballpark number your may be more may be less. Chevrolet Big Block Casting Number Location. 330865 1970-84 366/427/454 Open . but why? Could someone help me decode these as to Jan 1, 2011 · It's hard to justify putting a bunch of $ into iron heads, so it really just depends on what you want. 5cc after both heads were dusted ( one a few thou more as the heads had slightly different chamber sizes). Jun 1, 2005 · I wanted to build up my 454 and everyone said the -781 heads are great! Get them who hooWell now I have some I found out there are "bad" heads out there with short intake valve springs! Whats the deal with that? How can you tell if you have this undesireable head? I also found out there are 2 different casting numbers? 336781 and 386781? Dec 1, 2010 · Found this archived link to the old Mortec website over on the hamb and thought I'd post some of its info here in case it disappears forever. Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head. The Block Casting Number is located at the back ledge of the block behind the driver-side cylinder head. I am well familiar with Mortec. I traded some old junky dodge pickup for a crate motor. with 1. 1965/1966 396 block casting number 3855962. Jul 31, 2017 · I need help with a 427 I've had for about 20 years. 06 intake, 1. The Oklahoma NCRS Chapter members hold regular monthly meetings to share our interest in the Corvette. I have checked both casting heads and came up with about 120cc (+/- 1 or 2 cc) IMO, you wont go wrong using either head. they are oval port, open chamber. he said he ran the engine hot within 6 miles of replacing the Aug 17, 2009 · Of the available aluminum heads, casting number 12363391 features oval 290cc intake ports, 110cc combustion chambers, and either a 2. 12558060 - Vortec "L31" '96 350 complete cylinder head, cast iron, 1. R. com: 1932 Ford roadster project 1932 Ford three-window coupe project Big block Chevy engine projects Chrysler Hemi engines Corvettes Muscle cars Race car design software BBC ONE PIECE REAR MAIN OIL SEAL 3. Maybe for polution reasons. Mar 22, 2009 · I believe James is correct. If I could post pics, I would show you an example of a 088 casting iron rectangle head I did recently. i know the 049 and 781 heads are the ones to have but i know there are others that have the same port size. Chevy Casting Number identification including Block casting numbers, cylinder head casting numbers, Crankshaft and intake casting numbers. Jul 24, 2011 · Big Block Chevy Cylinder Heads nastyz28. (2) shows the position of the BLOCK CASTING DATE on the rear ledge of the block near the bell housing mounting surface. V/VI BBC crate motors when installing engine into early Camaro and Chevelle and GM "A" body cars. , 1st Gen Camaros, 2nd & 3rd Gen Camaros, El Caminos, Corvettes, 1966 - 1972 Pickups, Dirt Track Racing, such as that and more. I had the valve covers off tonight so I looked at the head numbers. Apr 5, 2009 · i think the number you actually have is 353049. V and VI BBC motors with one piece rear main seals. but with no luck. This information comes from Mortec. Casting number 12367713. Good luck. Mar 31, 2008 · I know a little, but not a lot. Considering putting this engine together and running on alky with a tunnel ram and Enderle Bird. The casting numbers on my 454 is "12550311. I noticed on 66 396 360 Hp intake manifold that the one manifold casting number 3866948 was an oval port intake for a Quadrajet carburator and on the next intake down it says that a 396 390 hp is the same number 3866948 . @ . 19 x 1. Casting No 14044861 Mark IV, aluminum, rectangular port, open chamber with 106cc . Casting Number Years Engine Side Comments 336706 74-78 350 RH 336707 74-78 350 LH 336708 74-78 350 RH 336709 74-78 350 RH Camaro & Z-28 with A. 76" STROKE used on '65-'90 Mark IV 366T, 396, 402, 427 or 427T Jul 26, 2006 · New guy with question here. Frank Feb 7, 2010 · Re: rect port head casting number 3964291 For the most part. Nov 20, 2010 · It has a small (for a BBC) 113. Yeah block casting number did end in 445. 72 exhaust valves. 55 Chevy Field car "Another One On Jack Stands" Chevy V8 Casting Number Locations Chevy V8 SBC Block and Head Casting Numbers Chevy V8 BBC Block and Head Casting Numbers Chevy V8 "W" Motor 348-409 Casting Numbers Chevy V8 Crankshaft Casting Numbers Chevy V8 Crankshaft Journal Sizes Chevy V8 Bore and Stroke List Chevy V8 Notes SBC Crate Motors BBC Crate Motors SBC Cylinder Heads Holley Carb Nov 26, 2015 · Got these heads on my 555 I purchased and can't really find any info on em other than they are 116cc ls6 replacement heads. Feb 20, 2008 · 702 casting number heads have a 98 cc chamber, oval ports, and generally 2. Home. thing had oval port heads dated 1970 i think. The indentifier number on the front starboard side deck are buzzed off. Jun 16, 2008 · Wasn't the 1969 ZL1/L-88 Forged steel nitrated cross drill crank casting number 7115 and 69 Copo L72 427 cranks 6223? By the way I have one of those 7115 cranks ,STD. com) block you are going to find a set of 3 to 5 numbers or letters! lots of BBC have the PASS for Sep 19, 2011 · The Mortec casting numbers site has been redesigned and just relaunched this week. Aug 24, 2022 · I think the casting number is 10068286, but the 5th # could be a 9. php mortec. I have not physically seen the casting numbers yet since I have not gone down there yet. They are for sale locally. About the heads, it was a fuel injection motor and all I here about these motors is the heads suck. Jul 29, 2009 · C3 Tech/Performance - bbc heads cast# 886781 - Can someone tell me if $125. Joined Aug 24 Jun 21, 2021 · The problem i have is this manifold isn't going to work to well with my peanut port heads so I'm having to look for heads as well,do I look for some 049 or 781 heads or do I bite the bullet and buy aftermarket ali heads (did I mention im trying to do this on a budget) ali heads here in New Zealand start at around $2500nzd Jun 23, 2006 · The casting number on this head defines it as a ’75-’87 454 pickup head. Thanks, Bill Mar 29, 2006 · The combustion chamber, depending on what work has been done to them (if any) are both going to be about the same. 76" STROKE used on '91-up Gen. BBC New Member. It could be a 302, 327, 350 block. The valves on this head are almost a 1/4-inch smaller than a typical big block valve. Heads are 1986-1988 427 Truck Oval port heads. Source MorTec. My uncle told me that when looking at SBC heads, you look at the last 3 numbers. Mar 5, 2008 · Instead, I found '73 049's. 88 exhaust The diagram above shows where each of the casting identifiers is located on the engine. 3693512 being either 1969 - 427 or a 1970-76 - 454. 67RAT you need to find your casting number on your heads that should be on head, take your valve cover off and see what you got. Corvette enthusiasts from Oklahoma and surrounding states who join together to celebrate and enjoy the Chevrolet Corvette. Are these considered "good" heads? Mar 2, 2013 · There are many websites that have partial listings of Chevy Small Engine Block Casting Numbers, Engine Assembly Codes and Partial Engine VIN Codes. 7 roller rockers, hydraulic roller cam with . Inline (6 cyl) Engines To determine the year of 235 or 216 engines, look just above the starter on 235 or maybe remove Aug 26, 2021 · On a small block Chevrolet, the casting number is found at the rear of the block on the driver's side (as is with Chevy's big block engines). 500" lift, dur. I. 330866 1968-78 366/427 Open . III aluminum cross bolted block with nodular iron crank, PM rods, aluminum symettrical port heads with 2. So, if your case, the casting number is 14010207, then here's the info; 350 CID, 1980 - 1985, 2 or 4 Bolt Mains. com/bbcmenu. Is it possible that the block is Nov 28, 2010 · For those years, as per the NHRA tech bulletins that were supplied by the OEMs back then, the accepted cylinder heads for '68 and '69 were heads with casting numbers ending in 215, 063, 290, and I think one more but can't recall now. 8 66 Jan 28, 2010 · The casting number on the block is 14015545 and the heads are 14081045, both of which point to a 78-87 truck block. 2 77-90 #3782870 4-Bolt 10. 2 68-85 #364776 4-Bolt 10. Apr 12, 2005 · Technical Notes: (see "Technical Notes" at the beginning of the Cylinder Head Group section for important information) This head was installed on LS-6 engine assembly P/N 366250 and LS-7 engine assembly P/N 3965774. 00 (Stroke) 113 (Cyl Head Volume) 4. Dec 10, 2005 · not sure this posted the right place, but my friend recently bought a 454 out of a truck. The engine ID code stamping is located on a flat pad in front of the passenger side cylinder head (big blocks can be in the same location or above the timing chain cover, with inline-sixes stamped on the passenger side of the block behind the distributor). 06" intake/1. I have lpoked everywhere to find out what the motor is. 72 exhaust Casting Years CID Chamber CC HP/RPO/Comments 330864 1970-81 366/427/454 Open . i`m hopeing that "standard oval port" means not the peanuts. Enhance your V8 engine performance with our 4L 454ci 781 BBC Cylinder heads. (Only 430 "ZZ430" limited edition crate motors were initially produced. JMO Aug 29, 2007 · Here's the number stamped on the front of the block, below the passenger side head, "F0208D" This is the number cast into the block near the bell housing, on the driver side "3789935" The last number looks like a five. 88, but they are shrouded a Feb 3, 2006 · The folks at mortec. 5 bore. I can decifer most of it, pretty sure the block will be a good candidate, it was running when we pulled it from my buddy's truck. 8 72-----Casting Number Mains Deck Height Year 427 CI Blocks #340220 4-Bolt 10. Question is about the heads. Currently 509 ci w/ 4. 12497186 - "Fast Burn" bare head, same as above, but no springs or valves. Nov 20, 2015 · Greetings all Just made puchase of 454 bbc and trying to identify block and heads. So without any further ado, let’s get started. I picked it up from a guy in Dallas when I bought a 327 for some one else. This casting # is listed on Mortec. The same flow numbers can be made with oval port AFR's at 0. 00"/1. That head worked very well. com, Chervolet By the Numbers and a few other books I have. I bought an engine that i was told come out of a 1996 chevy commercial size truck, I'm guessing a c-70. 10114186 CHEVY SMALL BLOCK V-8 Cylinder Head Casting Numbers. com think 241's are correct. 88 exhaust Dec 10, 2013 · Here are the links that ever numbers loving Chevy guy needs to have when buying stuff of junkyard spelunking – Chevy V8 SBC Block and Head Casting Numbers Chevy V8 BBC Block and Head Casting Numbers Chevy V8 “W” Motor 348-409 Casting Numbers Chevy V8 Casting Number Locations Chevy V8 Bore and Stroke List Chevy V8 Crankshaft Journal Sizes Dec 22, 2010 · An example of a casting number: 391436, or 3791362, or 14010202. Casting date was H10 8. Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads. :yes: 10069286 ~ 454 90-91 4-bolt, Mark IV, Short deck. The casting number is 3917215, and the date codes are F4-8 Mar 16, 2023 · It has dual front casting numbers 854/512. Chevrolet Big Block Head Casting Numbers. com http://www. 3999241 but has both 292/241. ALMOST ALL lists that I have found say these are 113cc. I may be slightly off on the valve sizes, but the point is they look tiny. 94-1. if you need any more info on them just visit mortec. 336710 74-78 307, 350 & 400 LH Chevelle,Camaro,Z-28,Nova and Passenger with A. So I don't Dec 11, 2010 · Hello all, My question is this. However, these tend to be vehicle specific, i. Block is 1401544. The Valves Measured at 1. I thought a 1970 LS-5 had 290 heads. Block = 3935439 Timing Stamp #1 = T0514IR Timing Stamp #2 = 185419791 Heads = 3904391 (one says GM1T I206 & the other says GM2T J106) Thanks in advance! Jun 3, 2021 · I should have been more clear, that "TBG" code above came from NastyZ28. I pulled the valve covers to see what the casting # was on the heads and it has #3931063,E69 and GM3T. Expect to pay a lot of money if you even find a usable pair. However, on some later Oct 31, 2008 · Chevy Exhaust Manifolds Casting Numbers Use these casting numbers to identify the exhaust manifolds you have. I find out some interesting stuff Oct 1, 2007 · I have some heads in question here that I COULD get they are BBC casting #3993820 with L7 70 & GM11T on them I looked on MorTec at them for numbers and they say 71 402 and 71-84 454 both have 113cc with 255/114 ports. 1964/1965/1966 283 block casting number 3834810 casting date B 21 6. Except for the chamber cc difference, are these heads basically the same, or is there a chance that the 049's are a better head? Apr 22, 1996 · Chevrolet Small Block Head Casting Numbers; Casting # Combustion Chamber Size (CCs) Intake Valve Exhaust Valve Production Years Misc. Thank you for visiting! Chevy V8 BBC Block and Head Casting Numbers Chevy V8 "W" Motor 348-409 Casting Numbers Dec 30, 2021 · The diagram above shows where each of the casting identifiers is located on the engine. Just scroll down and look for the different links. wondering if they are a decent head for a 396 i'm puting together on a budget for some one. However, the front number above the timing cover reads CG3331146, and according to a few sites, the 'CG' denotes an LS5 police block. short deck block, just like the casting number confirms. You can put 1500. Feb 4, 2008 · In my book "Catalog of Chevy V8 engine casting numbers 1955 to 1993" the head part # 3795896 was used on 327 62-64 Corvette 250 HP, 62-65 passenger car,62-67 truck, 283 63-67 truck,63-67 passenger car. Mar 7, 2007 · New user, first post. Also have the heads to it, #6272292. However, it seems once the backside of the block is clean and wire brushed, turns out the number is 14010207. i have the numbers off the block and heads . Fits '91-later Gen. This book was compiled by Cars and Parts magazine and was purchased at Books A Million. Jul 25, 2009 · engine tech - bbc casting #'s - hello i have a bbc that i was wanting to find out just exactly it was. Chevrolet. Gee, that narrows it 1968 - 1982 Corvette Specification Guide(1968-1982 Cylinder Head Casting Numbers) 1968 Cylinder Head Casting Numbers 3917291 300, 350 Horsepower 327 Cubic-Inch Engines 3917292 350 Horsepower 327 Cubic-Inch Engine 3917215 390 & 400 Horsepower 427 Cubic-Inch Engines 3919840 435 Horsepower 427 Cubic-Inch Engine (Cast Iron) 3919842 L88 & L89 (Aluminum) Jul 22, 2012 · Casting Number Mains Deck Height Year 402 CI Blocks #3969854 2 or 4 Bolt 9. I looked them up on mortec and found they are 98 cc from a 396. 4 cc combustion chamber, and the standard small valves used on all PASS heads of 2. After flat milling them . The heads I have found to be 69-70 396/427. Apr 5, 2004 · Need info on Cylinder head casting numbers Jump to Latest 4. 336765 1973-84 427/454 Open . Can you tell me if these are good HiPerf heads or would I be better with 396 head #3933148 on a stock 454 with low compression Jun 6, 2007 · Head casting# 10114156 91-up, oval, open, Gen V and VI 454, 118cc chamber. com Big Block Chevy V-8 Casting Numbers http://www. These are "open" chamber heads, about 115cc. Can anyone give me any info on these heads 3931063. VI 366T, 427T. Engine Size (ci) 10033867: 62cc: 2. Mortec Home Sep 12, 2006 · Also on the 2441 heads I noticed in mortec that there is a 3932441X head that was used in 69-70 on 350/400 with 80cc. the pad in front of the passenger side head reads=t1001trw c4b116871 on the back of the block it reads 999289 t12 drivers side head reads 12673 gm11t pass 336781 passenger I recently purchased a 72 Camaro that has a BBC in it. We’ll attempt to provide the best of them to you, rather than recreate the information here. Although the Phase 2 cast iron Bow Tie cylinder head has the same casting number (14011034) as the Phase 1 head it replaced, there are several significant differences between these two heavy-duty cylinder heads. 88 exhaust Apr 2, 2009 · There is all the small block and big block Chevy casting numbers for heads and blocks as well as all specs and applications. So I assumed the 3973487 would be similiar to the heads I have. My casting date was K27 72. . 19 intake, 1. Chevy V8 Casting Number Locations Chevy V8 SBC Block and Head Casting Numbers Chevy V8 BBC Block and Head Casting Numbers Chevy V8 "W" Motor 348-409 Casting Numbers Chevy V8 Crankshaft Casting Numbers Chevy V8 Crankshaft Journal Sizes Chevy V8 Bore and Stroke List Chevy V8 Notes SBC Crate Motors BBC Crate Motors SBC Cylinder Heads Holley Carb Casting No 3946074 Mark IV, L88 Zl-1, aluminum, rectangular port, open chamber with 118cc. t find any info supost to be a early 427 can any body help. 330867 1968-73 427t Open . 5:1 cr and a mech Nov 9, 2005 · There are no big block heads that start with a casting number of 88, switch that first 8 to a 3 and there you go. BBC TWO PIECE REAR MAIN OIL SEALS 3. 1. It can be used with both closed and open chamber pistons to produce various compression ratios. 122cc chamber. I have come to the conclusion from what I have seen of big block heads and engine build-ups that you really cannot pick an extremely bad head including the "peanut port" heads. They can be had for a reasonable price. these can go to 2. On the back, where the bell housing covers up, in the casting it says "HI PERF PASS F8". Seems to me that it would be with the casting numbers? One final question. 8 70-72 #3999290 Pass 2 or 4 Bolt 9. I have 981 casting wich are open oval ports 119cc there are 108cc oval ports and 98cc oval ports wich are closed chamber heads. I plan on goin aluminum heads at some point but if these will hold me over with out hurting me that would be good to. 500 valve numbers i have for the #186 SBC are for SS NHRA class ported head . Apr 27, 2004 · thats the same info i got from mortec. Couldn't really find much on stan weiss's site and mortec just listed the 781's with 118cc chamber, 256/114cc ports and the 049's with 122cc chamber, 255/119cc ports. Find cast numbers. Where do I find a complete list of all BBC casting number current to date? I tried MORTEC and they site is not responding. There is no difference for short deck and Tall deck heads on a BBC. The useful part of these codes are the string of digits that end in letters. com/bbc. I've had this block for 12 years and never bothered to find out what exactly I had. On top of a 1974 454 short block it makes 235 horsepower. 280 (Bore) 4. Related Products: Engine Assemblies Related Attachments (1) Jan 21, 2024 · Chevy V8 Engine Block and Head Casting Number Locations (mortec. This head would be best in applications where torque is everything and horsepower is of minimal concern. Pretty new to the BBC stuff. 4L 454 BBC MK5 Block with MK4 Apr 12, 2014 · Chevrolet Engine Block Casting Numbers April 12, 2014 Roadkill Customs Technical Info All engines are stamped with an engine ID code, consisting of assembly plant code, production date, and suffix code. What they don't go into detail about is the port work, intake, camshaft profile needed to get into the 700+ range. I was told the engine is a 454. "Victor Reinz 4918 Head Gasket 7. I am waiting on the block ID numbes and date codes. Use of either style head requires that the correct pistons are used, otherwise BBC Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. Casting No 12363401 Mark IV, aluminum, rectangular port, open chamber with 118cc. Oct 26, 2008 · My research on these heads tells me that they are always on the 366T Engines and are an option on the 427 and the 454. Chevy V8 Casting Number Locations Chevy V8 SBC Block and Head Casting Numbers Chevy V8 BBC Block and Head Casting Numbers Chevy V8 "W" Motor 348-409 Casting Numbers Chevy V8 Crankshaft Casting Numbers Chevy V8 Crankshaft Journal Sizes Chevy V8 Bore and Stroke List Chevy V8 Notes SBC Crate Motors BBC Crate Motors SBC Cylinder Heads Holley Carb Sep 4, 2002 · I found the 3973487 on mortec. See full list on engineaddiction. 040", they cced 113-114. Another place on that rear ledge I see "GM16" (maybe GMI6). Street use only. I go over some basics of Small and big block chevy block and cylinder head casting numbers, date codes, and suffix codes. Started at 117cc and near 118cc for head 2. In checking out my set, they have large oval ports and a chamber shaped like the 215/290/063 heads, only with a smaller intake valve. 02: 1. 2 68-76 #3855961 2-Bolt 9. This is a place to find like minded individuals to support your passion, whether you are driving a brand new If you would like to support Mortec, please link to us. Note that these valves are the same size as installed in aftermarket SBC heads; so increasing the size of the valves can wake these heads up when Oct 18, 2003 · C3 Tech/Performance - Head casting 3931063 - I just removed the valve cover from my 73 454 and was surprised to find the heads are casting # 3931063, were used from 69-70, valve size 2. Casting number 14096188 or 6272990. Feb 17, 2013 · The 781 I ran ( o49s had salt water ROT) came in right at 116. mortec. snowflake on the top. 039 (Compressed Gasket Thickness) 8 (# of Cylinders) Best Big Block Chevy ( BBC ) 781 Heads, Year:73-84 for sale at AlliedmotorParts. 940/1. Look up casting numbers for BBC heads and you should find the valve flow on a couple of the web sights. . 1966/1967 396 block casting number 3902406. com and check out all the gm bb head casting #s to get a better idea Aug 12, 2007 · The Phase 2 Bow Tie cylinder head (casting P/N 14011034) has the highest performance potential of any cast iron Chevrolet head. Mar 10, 2012 · 336781 Cyl heads. com and they listed them as a truck head from 68-85. 9K views 3 replies 3 participants last post by SSpete67 Apr 6, 2004 Sep 11, 2006 · There are a couple of types of oval port heads, open and closed 3 varieties. e. Aug 29, 2006 · Here's one that will puzzle you, Its puzzled me and friends that know thier casting numbers for BBC Heads. The casting number is probably the most significant feature on a cylinder head as it's the hardest to alter. what you think this came on from factory ? Mar 8, 2011 · I am aware of the below casting numbers but are there any other casting numbers for factory GM BBC square port Winters' cast BBC HiPo heads known? From back in the day I mean, I know there were some GM Performance numbers too later, also with the later part number config like 123 Dec 5, 2001 · The last three numbers in the seven digit casting number are significant on SBC heads. RECTANGULAR PORT - Valve size 2. Chevrolet Big Block Cylinder Head Casting Numbers. they flow 255/119cc through the ports. 1967 327 block casting number 3892657. heads. 050" = 200'/203', LS1 crate motor comes with composite intake and throttle body, exhaust manifolds, computer, wiring harness, injectors, cast aluminum oil pan Some casting numbers are NOT listed as they may have been used in other models of the Chevrolet lineup but were NOT used in the Chevelle - such as the 1965 409cid heads #3830817 & #3852583 or 67 Camaro heads #3876775. 2 68-85 #473478 4-Bolt 10. com while trying to find out what I have. Sep 8, 2008 · Info I have for heads is from Cars& Parts Catalog of chevy V-8 engine casting numbers 1955-1993. Are they gone? All of the lists that I have found are up to 1990, and some say 1996 and up. But they are listed on the add as casting #3855961, 427, 66, 2 bolt according to what I found in Mortec and the heads casting are #3872702, 65/66396, 427 98cc Wish I could find ourt more than what Oct 3, 2005 · I have been told that 781 heads are the best flowing gm stock bbc head there is. T ~ Tonawanda engine assembly plant. 12495360 - Four quart oil pan kit. com. It is intended for off-highway applications only. Kit includes oil pump, pickup screen, four main cap bolts, dipstick, dipstick tube and oil pan gasket. TBM:thumbsup: Oct 25, 2021 · My block casting number is 12550313, which on Mortec says Gen V crate motor, Gen VI bare block. 454 build. thanks Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads. Some good casting numbers are: 191,192,461,461x,462 All of these heads are early and have no accessory mounting holes for the '69 and up "long w/p" alternator mount. Oct 29, 2007 · Are these heads any good. Re: FlowBench numbers on various SBC heads 07-04-02 08:43 PM - Post# 113476 In response to MaxRaceSoftware hido you have any real world numbers for 186 heads. There may be another useful set of numbers/letters, located on the front passenger side of the engine, right where the head and block meet. com Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head. 5" valves, 170cc intake runner volume, 64cc chambers, comes with springs, retainers and valves, has bracket/accessory holes, use with Vortec style intake manifolds (PN Aug 29, 2006 · Here's one that will puzzle you, Its puzzled me and friends that know thier casting numbers for BBC Heads. 94"/1. I'm going off Mortec's numbers, it has been machined so the deck numbers are gone. 3872702: ’65 and ‘66 oval port, closed chamber, 2. " Can someone find this Oct 18, 2009 · Technical Notes: (see "Technical Notes" at the beginning of the Cylinder Head Group section for important information) This head was installed on LS-6 engine assembly P/N 366250 and LS-7 engine assembly P/N 3965774. Go to Mortec site and it will give you the type and size head you have. oem rectangular heads belong on nothing under 500 cubes or a high winding 7 grand application and then with a dual pattern cam that favors that poor exhaust flow. I will tell you that in every other category, exhaust port size/shape, larger oil drainbacks, etc the 049 looked like a SUPERIOR head. i`m Mar 23, 2010 · I am thinking about buying a 1970 454 LS-5 engine. Although the Phase 2 cast iron Bow Tie cylinder head has the same casting number (14011034) as the Phase 1 head it replaced, there are several significant differences Dec 13, 2018 · It is intended for off-highway applications only. Sep 26, 2013 · Engine block casting numbers Oval port head casting numbers Rectangular port head numbers Big block Chevy valve covers Big block Chevy resources Some related pages on Roadsters. i`m going to look at it next monday so i haven`t seen the heads yet but from what the guy tells me it`s in pretty decent shape. 8 70-72 #3999290 Truck 2 or 4 Bolt 9. Then I read on Mortec numbers list that 10068286 Menu. The heads Feb 2, 2008 · Re: sbc head date codes While messing around under the hood today I finally decided to see exactly what my engine block came from. 60 : over the counter 23 degree, angle plug, 196cc intake runner, aluminum : 10045434: 55 cc : Over the counter 15 degree, angle plug, raised runner, aluminum : 10051101: May 6, 2012 · Here is list of all OEM oval port heads OVAL PORT - Valve size 2. This guy said he had them on his 454 and had recently replaced the bottom end. 06/1. 55" valves, 1. 88-inch or 2. 020 (Deck Clearance) 0. i've been to mortec and found out a little bit of info on them but i was wondering what the compression is on a 78 454 and whatthe vavle size is in those heads that i have. 25/1. I finally got around to getting my "spare" set of big block heads out of hiding. 19- and 1. 88-inch valves. All I have found is #3999289. 6xx exhaust. Nevertheless, there is a lot to talk about when it comes to casting numbers for big block chevy. Both heads are closed chamber according to the Mortec site, one head has a 1cc smaller chamber than the other. Apr 6, 2008 · What I also discovered was that in the years 1970 - 1973 these heads had a head volume of 113cc, but late in 1973 and through 1984 the combustion chamber was resized to 122cc. com Save Share The Block Casting Number designates veries information of the block such as the displacement, the year of production, 2 or 4 bolt main, and also vehicle application. Thanks for the . All depends on your pistons and the cam u are running Go to mortec. 750hp on pump gas, at 489 cubic inch. Felpro Permatorque head gaskets have a compressed thickness of . The casting #is 3998289. Oct 15, 2022 · The big-block engine casting numbers serve as a means of distinguishing an engine block by designating the casting number, the year of manufacturing, and the CID (cubic-inch displacement). I have the block & head casting numbers listed below. 9 (Dome Volume) 0. Re: BBC Casting # 343772 - opinions welcome 03-22-02 02:21 PM - Post# 97829 In response to BigDogSS My opinion is that this will be a decent head for your application. 039" So, using Summit's compression calculator with these numbers: 4. As far as the block goes My book does not show anything. There is even a section devoted to 409s. Casting No 3946074 Mark IV, L88 Zl-1, aluminum, rectangular port, open chamber with 118cc. By definition, this is a Gen IV, right? May 9, 2007 · Looking for any info on a set of big block heads casting number 3872702. Dec 31, 2007 · BBC Heads - 3917215. Dec 19, 2006 · Here is a list of 366/396/402/427 cranks from Mortec. Currently I have 049's on my engine that cced at 121-122. Feb 15, 2007 · Its a BBC Casting number 3999290 with the following numbers stamped on it: Conv GM9T, 621 72, HI Per Pass, F9. The goal is to have a comprehensive database of small-block engine information maintained by the community. Feb 20, 2008 · General Q & A - Chevy BB heads #10101140 - I have a pair of large oval port heads with casting #10101140. 09721 ~ July 21st 1990, not sure about the 9, maybe denotes 1990. 186, 187 and 414 These are later model and have the accessory holes. Cylinder Head ID. I do have MorTec to help. They are GM p/n 12363425, casting #14044861 alum heads. Casting number 14096188 or 6272990 Feb 20, 2019 · Aluminum heads with casting number 3919842 were factory cylinder heads for L89 and L88 engines. Can somebody explain if these heads will work well as opposed to some of the other well known casting numbers or the Dart and World (fairly low end price) from Summit/Jegs. com and not Mortec. ) 1964-1965 327 block casting number 3782870. Mar 8, 2004 · FYI here is some info I collected on a set of 772 cylinder heads that was not included in the Mortec site. htm A new 23 degree SBC aluminum head has been released by GM/Performance Parts for '99 (PN-12464298, Casting number - 12367713). You need to look at the casting date located under the valve cover area. 00 is a good price to pay for a set of BBC casting # 336781 complete heads. I found that people have claimed casting numbers of 14015445 is an LS6 block, but many many other resources say that if you dont Small Block Chevy Intake Manifold Casting Numbers Years Casting CID bbls Material Carb Application 1974-76 340261 350 4 iron Q-jet A B F X/160,185,195,245,250HP 1973-81 340266 305,350 2 iron - A B F G Chevy V8 Casting Number Locations Chevy V8 SBC Block and Head Casting Numbers Chevy V8 BBC Block and Head Casting Numbers Chevy V8 "W" Motor 348-409 Casting Numbers Chevy V8 Crankshaft Casting Numbers Chevy V8 Crankshaft Journal Sizes Chevy V8 Bore and Stroke List Chevy V8 Notes SBC Crate Motors BBC Crate Motors SBC Cylinder Heads Holley Carb Aug 27, 2003 · I have a set of heads and the casting number is 14081045 and i know they are off of a 78-87 454 but i'm trying to determine the cc's so i can get the right Aug 24, 2001 · C3 Tech/Performance - # Questions on 3931063 Heads - the previous owner of my 69' replaced the original 390/427 with a 454 from a 72-73 Chevelle or Monte-Carlo. Use on Gen. V and Gen. The new 350 cubic inch "ZZ430" crate engines were the first motors to get the new heads. (1) shows the location of the HEAD CASTING NUMBERS and the HEAD CASTING DATE located under the valve covers, in the rocker arm valley. 72" exhaust. 065 intake and 1. accueil engine code. It now also includes a Mechanics Forum . Don't see why not, as they are both open chamber oval port heads with apparently the same size combustion chamber. Doesn't make sense to me. 1964-1966 283 block casting number 3849852. "T1124TBG" T- Tonawanda Engine Plant 1124 is month/month/day/day so 11/24 = Nov 24th TBG the string quoted above Dec 12, 2008 · Someone mentioned 454 heads with cast numbers: 049 and 781 are good 236 and 360 are not as good What about 045 heads? good or not as good? Is there a more complete list?(mortec, thanks Mike) Blocks the same thing. The 8878487 is the casting number on the heads that I have. Where would this x be found. He says it has 820 heads. Does anyone have or have seen any flow numbers for the heads? Curious what kind of power they will support. Casting numbers are found under the valve cover. casting number: 3956618 According to info this block was made only in 1969. I have heads that came off the engine I pulled from my 72 C20, it's stamped as a 3999290 block, but the heads are dual stamped too. This is the info as Mortec has it listed. tuzonxl cddmcv srrwqe sdkxagav atj dbi tolwzsp flhr pun gnjy