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Small block Chevrolet head thickness question ???

Discussion in 'The Hokey Ass Message Board' started by bluecar, Nov 5, 2011.

  1. bluecar
    Joined: Oct 14, 2009
    Posts: 54

    bluecar
    Member

    Hey,

    Is there an easy way to tell how much has been surfaced/milled off of a SBC cylinder head ??

    A place on the head to measure ??

    The orignial thickness from the factory ??

    Just wanting to find a way to see if used heads have enough meat
    on them for a project engine.

    Thanks in advance,
    BC
     
  2. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 7,775

    mgtstumpy
    Member

    Check the casting number to establish what they are originally from and you'll then know what the OEM chamber volumes were. Provided the heads haven't been worked, just CC the chambers.
     
  3. bluecar
    Joined: Oct 14, 2009
    Posts: 54

    bluecar
    Member

    mgtstumpy,

    Thanks for the idea.

    I was hoping that there was a way to measure what I have
    heard called the "thumbprint" to see how much material was left.

    That way when I am out or at a swap meet a quick measure
    with the caliper can tell me if the set of heads are still
    serviceable.

    Best,
    BC
     
    Last edited: Nov 5, 2011
  4. tommyd
    Joined: Dec 10, 2010
    Posts: 11,351

    tommyd
    Member
    from South Indy

    I think you use the calipers on a head bolt boss to the milled surface. Sorry, I don't know the spec but somebody's gotta know on here.
     
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  5. afaulk
    Joined: Jul 20, 2011
    Posts: 1,189

    afaulk
    Member

    Better do what stumpy said and measure the "thumbprint" with a burette. Its a good thing to know your compression ratio xxxactly, then you KNOW where to go from there with cam selection and fuel requirements + it just feels good to know ---
     
  6. 1971BB427
    Joined: Mar 6, 2010
    Posts: 5,538

    1971BB427
    Member
    from Oregon

    I doubt you could do a reading at a swap meet accurately. Easy to do once you've got them home, but then it's too late.
     

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