you should do as lou suggested and go with .020/.022, i set mine at .024 because with the heat that high compression creates, if the gap is to close the ends will hit when they exspand and pin will be pulled out of the piston when it sticks in the bore

I have mine at 0.022" for an 11:1 motor, so hopefully that's enough!

Lou

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Home of Slant6-powered fun machines since 1988

Some pistons call for different gaps. Hypertec come to mind.

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'72 Duster 198 stock cam, 3:23's

93 D350 Cummins THD Maxfuel 35mpg parts to hit 400hp+ Suncoast Cat2 A518, converter DDP Stage III injectors 62/64 HX35, 3 piece manifold, 4" Diamond Eye, Gear Venders OD. Stage I street/tow PDD head on order.

the position company set them at the .003 for a race application but I am building mine to drive almost daily I think I am going to Go will Lue and set them at .022 of may be .021. Thanks for the help god knows I need it

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225+0.080 at 10:1
268cam
holley 390
clifford headers
8 3/4 355's lsd
kh brakes
electronic ing

You really need a bigger gap for racing, not smaller. 0.020-0.022" should do fine.

Lou

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Home of Slant6-powered fun machines since 1988