View Full Version : Big block head casting #s


76z28
03-14-2011, 03:22:53 PM
What are the heads to look for and stay away from?

5spd540
03-14-2011, 05:47:51 PM
A good set would be 781 or 049

76z28
03-14-2011, 06:04:05 PM
Alright thanks, all i really wanted to know!

theflash
03-14-2011, 06:25:25 PM
Those are the large chamber ovel port heads.

496z28
03-14-2011, 07:40:41 PM
The truth is.. 781 and 049's are the best large oval port heads because of the large intake runners. Those are good for upper rpm ranges.

Peanut Port BBC heads are just as good for "STREET" cars. These are good for bottom end torque.

I don't pass up any BBC head that isn't cracked.

76z28
03-14-2011, 07:55:54 PM
This is going to be a side project motor for either my camaro or my dads bel air.. So we will see
I found another but he is unsure of size

76z28
03-14-2011, 07:59:55 PM
I found one from like 1988 for 300 bucks would that be a good buy? It is in a dump truck is what the guy told me and i can hear it if i want. I do plan on going through it if i do buy it. Any suggestions on what to look for? How can i tell it is a 366(something i dont want)

496z28
03-14-2011, 08:08:44 PM
If its in a dump truck its not a 454. It's most likely a 366 or a 427T

If its still in the truck look at the glove box lid, it should have a sticker there, if not, Check the casting numbers on the drivers side rear of block on the bell housing flange.

Rich Schmidt
03-14-2011, 09:17:53 PM
If you are planning on building up a stock 454 truck engine then a set of early closed chamber heads will bring the compression up. All the pre 69 heads flow as well as the 781's but have chambers that are about 20 cc smaller. Good for about a 1.5 point bump in compression. My favorite castings are the old 063 heads but there are many others

rustbucket79
03-15-2011, 12:05:28 AM
Stay away from the 236 castings, they are the large chamber peanut port heads common in the 80's.

76z28
03-15-2011, 12:47:36 AM
I found another one I'm gunna look at Wednesday it's everything but the cam,lifters, intake and accessories it's a 427 4 bolt main with roller rockers and a forged crank

hogg
03-15-2011, 12:48:53 AM
what about the 290 closed chamber

Coolvette
03-15-2011, 02:03:32 AM
Sorry for threadjacking but IŽd like to know your feelings about those heads, sitting on my engine: 3931063/3917215

The engine is a bored out 402 with 10,5-pistons.

Any comments to that combo?

76z28
03-15-2011, 03:11:49 AM
Sorry for threadjacking but IŽd like to know your feelings about those heads, sitting on my engine: 3931063/3917215

The engine is a bored out 402 with 10,5-pistons.

Any comments to that combo?

Not a thread jack lol...im looking for the same answer! so any info givin to that question will help me a buncH!

hogg
03-15-2011, 09:25:30 AM
i got a 402 ,30over ,with the 290 close chamber heads? came with it ,not together yet, like to see all of the answers

BigBlock 79Z
03-15-2011, 04:31:27 PM
Just my oppinion but I try to stay away from closed chamber BBC heads because the valves are so big. They tend to shroud the intake valve.

rcb1970Z28
03-15-2011, 06:15:34 PM
If you are getting into bigger cubes, the 990/188 are a good choice (sq pt, open chamber)

496z28
03-15-2011, 06:18:04 PM
Stay away from the 236 castings, they are the large chamber peanut port heads common in the 80's.


I had a set of those on my first 454. Good set of heads for the street.

Why, I say WHY does everyone dog the PP heads? I've seen (along with alot of engine builders here) peanut port heads go atlease 450hp.

These heads where put on trucks for Torque. Torque is king on street.

rustbucket79
03-16-2011, 01:41:47 AM
I've heard that the "215" is a good casting to start with.

For me I dog the PP heads because I hate that the exhaust port is the same size as the intake.....:p FWIW in my market the iron heads are nearly a dead issue. The Edelbrock heads are cheap enough to consider, and anyone looking to make better power we get them into the AFR 305's. Big power builds we've used the AFR 357's and the Dart 355 CNC's. (out of the box 900+ HP w/race gas)

5spd540
03-16-2011, 04:55:25 AM
We take 781 and 049 haeds and can blow the eddys stuff out the water with a little work and half the money in our shop

theflash
03-16-2011, 06:38:55 AM
We take 781 and 049 haeds and can blow the eddys stuff out the water with a little work and half the money in our shop

What kind of machine shop do you work at where you need to come on here to ask how to remove the rubber insert in a motor mount, but you can do better head port work than Edelbrock?

JONESYFXR
03-16-2011, 11:02:09 AM
Here you go.....

Chevrolet Big Block Cylinder Head Casting Numbers

RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust Casting Years CID Chamber CC HP/RPO/Comments

3856208 1965 396 Closed 109cc 375hp/425hp z-16 chevelle
3873858 1966-67 396/427 Closed 109cc 375 L-78
3904391 1967 396/427 Closed 107cc L-71/L-72, 1.72
3904392 1967 427 Closed 106.8 430, 435 L-88/L-89, 1.72 ex
3919840 1967-69 396/427 Closed 107 375 L-78 425, 435 L-71/L-72, 425 COPO
3919842 1968-69 396/427 Closed 106.8 375 L-89 430, 435 L-88/L-89, 1.84 ex
3946074 1969-71 396/402/427/454 Open 118cc 375 L-89 430 L-88/ZL-1 425, 465 LS-6/LS-7
3964291 1969-70 396/402/427/ Closed 109cc 396/402/427/454 large or small spark plug
3964292 1970 454 Closed 109cc 450 LS-6,
3994025 1971 454 Open 118cc 425 LS-6,
3994026 1971 454 Open 118cc LS6
6258723 1971 454 Open . .
6272990 1970 454 Open 118cc service replacement mkIV
10045427 400/454/455 . . Pontiac/chevy aluminium small port /race
10051128 1990-94 454 Semi Open 72cc IP 400cc, bowtie, sym port
12363401 1996-up . Open 118cc bowtie aluminium mkIV gen.V gen.VI
12562934 2000-up 502 Open . gen.VI 502 marine
14011077 1989-94 454 Open 118cc IP 295cc, replacement, C port
14044861 1989-94 454 Open 115 425, 105.0cc, IP 380cc, bowtie, W port
14096188 1970-71 454 Open 118cc service replacement ls-6 markIV
14097088 1991-up 454/502 Open 118 .
24502585 1997 . . . olds/chevy aluminium

OVAL PORT - Valve size 2.06 intake, 1.72 exhaust

Casting Years CID Chamber CC HP/RPO/Comments
330864 1970-81 366/427/454 Open . .
330865 1970-84 366/427/454 Open . .
330866 1968-78 366/427 Open . .
330867 1968-73 427t Open . .
336765 1973-84 427/454 Open . .
336768 1973-76 427t Open . .
336781 1973-85 454 Open 113cc .
343771 1968-85 366/427/454 Open . .
343772 1976-84 366/427/454 Open . .
343783 1975-78 454 Open . car & truck
346236 1975-87 454 Open 113cc .
346238 1975-87 454 Open 113cc .
352625 1970-76 454 Open . truck
353049 1970-73 402/454 Open 113cc .
366725 1974-78 427 . . .
473328 1968-85 366 Open . .
3856206 1965-66 396 Closed 97.2cc 325
3856213 1966-70 366 Closed . truck
3856260 1968 396 Closed . truck
3872702 1966 396/427 Closed . 325, 360 L-34/L-35 390, L-36 98.4cc
3876875 1966-70 427 Closed . truck
3904390 1966-67 396/427 Closed . 325, 350 L-34/L-35 390, 400, L-36/L-68 98.4cc
3904393 1966-68 366 Closed . truck
3908952 1967 427 Open . truck marine
3909802 1966-67 396/427 Closed 109cc L-34/L-35 L-36/L-68
3917215 1967-69 396/427 Closed 109 325, 350 335, 385, 390, 400 L-34/L-35
3917219 1966-70 366/427 Closed . truck
3931063 1969-70 396/427 Closed 109cc 325, 350 335, 385, 390, 400L-34/L-35
3933148 1969 366/396 Open 122cc 2V/427 265 car & truck
3933149 1969-70 427 Open 122cc truck
3935401 1968-76 427 Open . .
3964280 1966-70 427/454 Closed . 335, 385, 390, 400 LS-5
3964290 1969-70 396/402/427/454 Closed 109cc 325, 330, 350 400 ls-5
3965198 1969 396 . . truck
3975950 1968-70 366/427 Closed . truck
3986133 1970-85 366/427 Closed . truck
3986135 1969-73 366/427 Open . .
3986136 1970-84 366/427 Closed . truck
3993820 1971 402/454 Open 113cc 300, 330 LS-3 365 LS-5
3999241 1972 402/454 Open 113cc 240, 300, 330 LS-3 365 LS-5
6272292 1971 402/454 Open . 240, LS-3 270, LS-5
10052902 427 Open . MKIV
10101136 1991-94 454 Open . truck
10114140 1991-up 366/427 Closed . gen.V
10114156 1991-up 454 Open 118cc gen.V
10121033 1978-88 454 Open . truck
10141279 1996-up . Open 100cc Vortec7400
10487052 1977-90 366 Open . .
12352783 1979-93 454 Open . truck
12363391 1996-up . Open 110cc aluminium MKIV gen.V gen.VI
12558162 2001-up 496 Closed . VII Voretc 8100 truck
12560241 1998 -up . Closed 100cc Voortec 7400
14025175 1983-93 454 Open . truck
14081044 1986-90 454 Open . truck
14081045 1978-87 454 Open . .
14081052 1985-87 366/427/454 Open . truck Marked HIPERF
14092359 1986-89 427 Open . truck
14092360 1985-89 454 Open . truck
14101398 1986-90 454 Open . truck

76z28
03-16-2011, 11:53:59 AM
Thanks Jone!!!!

76z28
03-16-2011, 11:54:39 AM
What kind of machine shop do you work at where you need to come on here to ask how to remove the rubber insert in a motor mount, but you can do better head port work than Edelbrock?
HAHAHA damn kinda ruthless

5spd540
03-16-2011, 12:24:33 PM
What kind of machine shop do you work at where you need to come on here to ask how to remove the rubber insert in a motor mount, but you can do better head port work than Edelbrock?
My brother owns a machine shop and I back him for the money and I am not telling you we do better work than eddy but we can do a set of iron heads for half of what eddys cost but you will still have iron heads. This is the first car I have not just went and bought new parts for

5spd540
03-16-2011, 12:25:53 PM
What kind of machine shop do you work at where you need to come on here to ask how to remove the rubber insert in a motor mount, but you can do better head port work than Edelbrock?
You will never see a question about any machine work on a motor just about the rest of the car.

496z28
03-16-2011, 01:52:22 PM
Jonesyfxr, why does your listing show 781's at 113cc? My book shows 118cc.

Dave Nelson
03-16-2011, 03:38:36 PM
I believe ther are other mistakes on that listing.......290's are not 109 cc.

JONESYFXR
03-16-2011, 05:53:52 PM
Jonesyfxr, why does your listing show 781's at 113cc? My book shows 118cc.

I just copied and pasted from a site, but I've been told you have to cc a cumbustion chamber to make sure.

Here's the site I took it from....

http://www.minuit10.net/EngineCode/chevy/BBChevyCylinderHead.htm

bfmgoalie
03-16-2011, 10:55:12 PM
I personally like the '074s....

hogg
03-16-2011, 11:26:31 PM
i have seen the closed chamber 290's saying 100.9cc,and what about the statment about the valves being large,seems smaller on that list

rustbucket79
03-17-2011, 01:16:07 AM
Definately need to cc any head if you want ACCURATE compression ratio information, this applies to stock, used, and even new heads.

5spd540
03-17-2011, 04:51:15 AM
Definately need to cc any head if you want ACCURATE compression ratio information, this applies to stock, used, and even new heads.
This is a fact I have seen stock iron heads off as much as 7cc from one cyl to another

theflash
03-17-2011, 10:20:15 AM
HAHAHA damn kinda ruthless

Let's just say I don't believe everything I read on the internet ;)

76z28
03-17-2011, 12:46:59 PM
Does any one know what year they went to roller cams in factory blocks?

496z28
03-17-2011, 08:22:00 PM
Does any one know what year they went to roller cams in factory blocks?


86 in sbc i think. 96 in bbc

kik_start
03-19-2011, 11:26:44 AM
What kind of machine shop do you work at where you need to come on here to ask how to remove the rubber insert in a motor mount, but you can do better head port work than Edelbrock?


LOL

PPM
03-20-2011, 07:05:45 AM
How well do the rollers perform?

Air_Adam
03-20-2011, 02:57:59 PM
How well do the rollers perform?

Aren't those the Gen VI blocks?

Also known as the 'Gen Fix' blocks, because with that redesign, GM fixed alot of known issues with the BBC, mainly lubrication system issues, as well as adding roller lifter provisions and IIRC, using the same coolant port layout as the old Mk IV engine, so all of the old BBC heads will work on these blocks without mods or special gaskets. These are the blocks GM is using now for their crate engines, like the 427, 454 and 502.

theflash
03-20-2011, 04:07:37 PM
Aren't those the Gen VI blocks?

Also known as the 'Gen Fix' blocks, because with that redesign, GM fixed alot of known issues with the BBC, mainly lubrication system issues, as well as adding roller lifter provisions and IIRC, using the same coolant port layout as the old Mk IV engine, so all of the old BBC heads will work on these blocks without mods or special gaskets. These are the blocks GM is using now for their crate engines, like the 427, 454 and 502.


One thing that is different on the gen VI block is the timing cover. There is only about 3 companies that make them so you can use a double roller timing chain, and they aren't cheap. Why GM didn't make the stock cover to work with a double roller is beyond me.

rustbucket79
03-20-2011, 06:27:41 PM
We had a factory mark V or VI cover that worked fine with a double roller timing set. I don't recall if it was cast aluminum or stamped steel.