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Old 01-30-2008, 05:41 PM   #1
flatblackindustries
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Default Chevy straight six head numbers

Anyone help decoding these Chevy / GMC head numbers for a 235 stright six?
3838848

I could not for the life of me find any match in my resources.

thanks,
N
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Old 01-30-2008, 06:13 PM   #2
Stovebolt
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Default Re: Chevy straight six head numbers

You have a late 50's to end of production 235 head.

the numbers are available on the Inliners web site, but its down at the moment.
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Old 01-30-2008, 06:14 PM   #3
yorgatron
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Thumbs up Re: Chevy straight six head numbers

Quote:
Originally Posted by flatblackindustries View Post
Anyone help decoding these Chevy / GMC head numbers for a 235 stright six?
3838848

I could not for the life of me find any match in my resources.

thanks,
N
check for just the last 3 numbers "848"
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Old 01-30-2008, 06:27 PM   #4
THE235KID
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Default Re: Chevy straight six head numbers

It isn't on the list for the chevy 6's. It must be a GMC.
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Old 01-30-2008, 06:30 PM   #5
Stovebolt
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Default Re: Chevy straight six head numbers

Quote:
Originally Posted by mynameisnotpete View Post
It isn't on the list for the chevy 6's. It must be a GMC.
Nope - not on my GMC list.

"848" is a Chev casting number.
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Old 01-30-2008, 06:38 PM   #6
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Default Re: Chevy straight six head numbers

"848"=`58-`62 thats a desirable head.
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Old 01-30-2008, 07:48 PM   #7
THE235KID
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Default Re: Chevy straight six head numbers

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Originally Posted by Stovebolt View Post
Nope - not on my GMC list.

"848" is a Chev casting number.
The only list I have is the one in the Patricks catalog. Are there more numbers than what he lists??
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Old 01-30-2008, 07:57 PM   #8
gas pumper
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Default Re: Chevy straight six head numbers

848 is the good one. The holy grail of 235 heads

it's [B]383 6 848

just walked three miles in the snow barefoot to check. uphill both ways, too

Last edited by gas pumper; 01-30-2008 at 08:03 PM. Reason: added info
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Old 01-30-2008, 08:10 PM   #9
customcory
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Default Re: Chevy straight six head numbers

I think the 848 head is for the 261 engine too. I might be wrong.

Last edited by customcory; 01-30-2008 at 08:11 PM. Reason: spelling
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Old 01-30-2008, 08:14 PM   #10
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Default Re: Chevy straight six head numbers

Nope, your right. 261 also.
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Old 01-30-2008, 11:52 PM   #11
moparsled
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Default Re: Chevy straight six head numbers

I think it goes back before '58, I've seen at least two '56 engines with them.
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Old 01-31-2008, 12:52 AM   #12
seventeenseconds
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Default Re: Chevy straight six head numbers

Quote:
Originally Posted by gas pumper View Post
848 is the good one. The holy grail of 235 heads

it's [B]383 6 848

just walked three miles in the snow barefoot to check. uphill both ways, too
indeed, it's the highest compression stock head. good stuff.
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Old 01-31-2008, 09:11 AM   #13
Road Runner
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Default Re: Chevy straight six head numbers

The first '848' heads came with 1956 passenger cars and 235s had 8.0 cr per manual specs. After 1958 they were listed with 8.25 cr, which indicates they had factory milled heads and possibly decked blocks by about 0.020

They got smaller chambers with highest compression ratio of any early 6 heads and also have a higher nickel content, helping to prevent cracks from heat stress.

Most guys mill them to increase ratio further.

Fits with all 235 and 261 blocks.

The corvette from 1953-55 used the smaller 848 chamber casting first, but these heads had a different casting number then.
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Last edited by Road Runner; 02-07-2010 at 11:13 AM.
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Old 01-31-2008, 09:25 AM   #14
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Default Re: Chevy straight six head numbers

Needs steam passages drilled for a 235 head to work on a 261
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Old 01-31-2008, 09:52 AM   #15
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Default Re: Chevy straight six head numbers

Also use different head bolt torque sequence for 261 blocks, for the same reason.
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