Port matching intake and heads??????//
thanks
thanks
The final product looks rough (its designed that way mix air and fuel before hitting the chamber). So, basically you have a rough inside edge that meets the head in right spot (all done by hand, cross grain to the flow...fun...huh). Also on the Fast 90, if it is done right, internally there is not much material left and it all has to be sealed correctly at the right points with high temperature RTV silicon in addition to stock gasket.



