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Thread: double hump heads? question??

  1. #1
    Senior Member DYNO OPERATOR
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    Mar 2009
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    Booneville,Ms
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    505

    double hump heads? question??

    Would stock double hump heads hold to 12.5:1 compression?

  2. #2
    Senior Member DYNO OPERATOR
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    Mar 2009
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    Booneville,Ms
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    Well with new springs to match the cam and grinding the valves!

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2006
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    2,044
    define, "will it hold"
    ***IN GOD WE TRUST***

  4. #4
    my 355 is 12:1. double humps hold pretty good. had to put hardened seats and bigger springs on them.

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
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    4,143
    What the hell does it mean when you say a head "holds" :?

    as far as DOUBLE HUMPS GO,UNLESS YOU GET THEM CHEAP AND THEY NEED nothing I wouldn't bother...you will sink a bunch of money in them and still have a sub par head. If they are good and cheap/free then I'd use em if I were you since I know your budget is tight.

    jmo

  6. #6
    Senior Member RACING JUNKIE
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    Jan 2006
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    La.
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    2,890
    I've ran the 492's with 14 1/2 to 1 compression on gas 20/25 yrs ago, the set i had was roll milled to increase the compression, had them flowing in the 270's in. and 73% on the ex. In fact they ran as good as a set of fully ported Brodix 10's i had. I ran both sets on a 358" and a 406" motors.

    Zip.


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