i THINK you are suppossed to leave a bit betwixt the head and the gasket. meaning, don't port match the head to the EXACT dimensions of the gasket, leave a little bit of material. it'll form a step that'll help eliminate reversion back into the cyl.
the effects on a street car are probably quite negligable, but i thought i'd say something anyway
oh, and don't touch the intake ports. seriously.
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