Re: 305 vortec heads
a word of caution, if you are using flat tops and just using a thick gasket to drop compression you may just make the engine even more detonation sensitive since you are loosing all of your quench. You would be better of using a dished piston or grinding the combustion chambers bigger and running a quench of .038 to .040. It will be less detonation sensitive and probably make an extra pony or two over having a a quench of say .050
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