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I don`t think the examples "A,B,C" were meant as different shops versions of stage II porting,but as a reference as to the differece between stage 1,2 and 3 porting.




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to try and illustrate this i have a set of numbers for the intake port flow on some SR heads, all done to each shops "stage II" level of preperation.







OOPS read right through that


PRH446
10.084 @ 135.21 mph N/A through chambered mufflers,3300lbs. Stock stroke wedge