Porting Primary Plates
#4
You cannot go down as far on the primaries as the secondaries without some tapering around the water jacket. You can make the ports open and close at the same time. Just remember that out is open and up is close. You don't really want to go down on the primaries anyway because there is no way to match the primary and secondary port runners. Now I can't give you the technical reason for it, but I can tell you from experience that there is no power increase in making them the exact same size and it can cause slightly lumpy idle.
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