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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: Oct 7, 2006
    Posts: 637

    flatblackindustries
    Member
    from Las Vegas

    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: May 2, 2001
    Posts: 2,871

    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
    Joined: Jan 25, 2002
    Posts: 4,229

    yorgatron
    Member

    check for just the last 3 numbers "848" ;)
     
  4. THE235KID
    Joined: Apr 4, 2007
    Posts: 3,752

    THE235KID
    Member

    It isn't on the list for the chevy 6's. It must be a GMC.
     
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  5. Stovebolt
    Joined: May 2, 2001
    Posts: 2,871

    Stovebolt
    Member

    Nope - not on my GMC list.

    "848" is a Chev casting number.
     
  6. hotcoupe
    Joined: Oct 3, 2007
    Posts: 326

    hotcoupe
    Member

    "848"=`58-`62 thats a desirable head.
     
  7. THE235KID
    Joined: Apr 4, 2007
    Posts: 3,752

    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
    Joined: Aug 13, 2007
    Posts: 2,787

    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
    Joined: Apr 25, 2007
    Posts: 1,832

    customcory
    Member

    I think the 848 head is for the 261 engine too. I might be wrong.:D
     
  10. 52HardTop
    Joined: Jun 21, 2007
    Posts: 554

    52HardTop
    Member

    Nope, your right. 261 also.
     
  11. I think it goes back before '58, I've seen at least two '56 engines with them.
     
  12. seventeenseconds
    Joined: Mar 21, 2007
    Posts: 241

    seventeenseconds
    Member



    indeed, it's the highest compression stock head. good stuff.
     
  13. Road Runner
    Joined: Feb 7, 2007
    Posts: 1,057

    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
    Joined: Jan 24, 2007
    Posts: 1,793

    6inarow
    Member

    Needs steam passages drilled for a 235 head to work on a 261
     
  15. Road Runner
    Joined: Feb 7, 2007
    Posts: 1,057

    Road Runner
    Member

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

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