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Thread: 21 cc heads

  1. 03-28-2003, 06:09 AM #1
    stocer
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    21 cc heads

    i know head gasket thickness plays a role,but what should the cranking compression be with a 1997 merc drag?what is the minumum octane fuel required and what brands do u prefer?i have succesfuly ran 100 octane av gas for years with 26cc so iam thinking around 105 to 108 octane max.
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  2. 03-28-2003, 10:02 AM #2
    Fl Boy in ILL's Avatar
    Fl Boy in ILL
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    Gas

    I run 110 octane, with my tight heads.

    Rick
    "Conklin Racing" M/E 0494
    Sponsers,Conklin Racing, Speed-N-Sport Marine
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  3. 03-28-2003, 10:09 AM #3
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    ken medendorp
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    comp

    around 230 i think
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  4. 03-30-2003, 08:00 AM #4
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    Casey
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    Talking

    my drag has 220 with thin gaskets and 215 with thick ones. i run 110 sunoco.
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  5. 03-30-2003, 09:50 AM #5
    stocer
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    thanks guys for replys

    i ussually run merc gasket#27-822844-1.is there a thicker one and what is #?will a thicker gasket hold up better with these 21 cc?
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  6. 04-04-2003, 04:28 PM #6
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    CDave
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    Anyone try using pump gas and Toluene?
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