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I think they are ok with 16Gs with the FPR. But for 18Gs I think you'll need more. For heads you don't really need a radical porting job, they will flow plenty. I only have a mild porting job, but I wanted those stiffer valve springs so if you want them you might as well port he heads too... you know. Everything else on my motor is stock. : I am gonna stay with my 555's for a little while with 18G's until I decide what to do with the heads and intak etc. : --wes
 
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