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head gasket bore size in relation to cylinder bore?

Discussion in 'Newbie and Basic Turbo Tech Forum' started by bamf88, Sep 3, 2008.

  1. bamf88

    Joined:
    Feb 4, 2008
    this is something i've been wondering about for a while, is there a general rule of thumb for what size head gasket to get compared to cylinder bore? .010" over? .030?

    for example stock 4.00 inch cylinder bore = 4.010"? 4.030"? headgasket bore? i need to put new headgaskets on my shortblock before i drop my turbo kit on but i dunno what to get.

    any help would be appreciated

    thanks
     
    bamf88, Sep 3, 2008
    #1

  2. Brian Adams

    Joined:
    Oct 8, 2003

    Generally at least .030" - Some of it depends on what gasket is available (Ie: many are 4.100 bore, but work fine on a 4.00). You also have chamber designs that are large bore that should be considered.

    Too small of gasket bore hangs the fire ring into the cylinder/chamber, creating hot spots and potential issues.

    Brian
     
    Brian Adams, Sep 3, 2008
    #2

  3. knkfiend

    Joined:
    May 8, 2004
    so if you have a .040 block, you want at least a .070 gasket?
     
    knkfiend, Sep 18, 2008
    #3
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