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Old 06-30-2010, 11:24 AM
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"standard" head gaskets are usually around .040" thick (most fall in the .035-.045 range), and factory they put the piston about .020" in the hole, but some aftermarket pistons are setup to sit a little bit higher to make up for that or your machine shop might deck the block lowering it.

Assuming not to much of that has been done, you should be able to get into the mid/high 9's with a standard piston, OTOH, I'd probably be shooting for higher or lower than that... if you want to run on 87 octane, I'd want to get that down to about 9:1, since 4 wheeling can be a lot of moving slow with a heavy load on things, engines get hot and are more detonation prone than street/drag cars... Otherwise, if you're willing to run premium then I'd probably consider 10:1 or so to take advantage of the extra available power from the higher octane.
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