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 Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

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