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Chevy straight six head numbers

Discussion in 'The Hokey Ass Message Board' started by flatblackindustries, Jan 30, 2008.

  1. flatblackindustries
    Joined:
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    Las Vegas

    flatblackindustries Member

    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
  2. Stovebolt
    Joined:
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    Location:
    Victoria Australia

    Stovebolt Member

    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.
  3. yorgatron
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    yorgatron Member

    check for just the last 3 numbers "848" ;)
  4. THE235KID
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    THE235KID Member

    It isn't on the list for the chevy 6's. It must be a GMC.
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  5. Stovebolt
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    Stovebolt Member

    Nope - not on my GMC list.

    "848" is a Chev casting number.
  6. hotcoupe
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    hotcoupe Member

    "848"=`58-`62 thats a desirable head.
  7. THE235KID
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    THE235KID Member

    The only list I have is the one in the Patricks catalog. Are there more numbers than what he lists??
  8. gas pumper
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    Boonton, NJ

    gas pumper Member

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

    it's 383 6 848

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

    I think the 848 head is for the 261 engine too. I might be wrong.:D
  10. 52HardTop
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    North Haven Ct.

    52HardTop Member

    Nope, your right. 261 also.
  11. moparsled
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    moparsled Member

    I think it goes back before '58, I've seen at least two '56 engines with them.
  12. seventeenseconds
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    seventeenseconds Member



    indeed, it's the highest compression stock head. good stuff.
  13. Road Runner
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    CA Mountain Desert

    Road Runner Member

    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.
    Last edited: Feb 7, 2010
  14. 6inarow
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    6inarow Member

    Needs steam passages drilled for a 235 head to work on a 261
  15. Road Runner
    Joined:
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    Road Runner Member

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

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