Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve the quality and quantity of the air flow. Cylinder heads, as manufactured, are usually suboptimal due to design and manufacturing constraints..Port flow was designed to be high in the . . valve lift area to make power with relatively low lift truck camshafts, whereas the old school Gen I heads liked higher lift camshafts to make their power..Porting is relatively easy to do as far as removing metal goes, BUT knowing where and how much to remove makes all the difference between a good performing head and a boat anchor. Photos of ported heads can look very impressive..Basic instructions of cylinder head porting to increase Most production heads and many aftermarket replacement heads have a more abrupt turn than necessary as a .
With the porting work complete, McKenzie flowed the heads on his Superflow bench and reported a gain of cfm on the intake at . inch lift and cfm at . inch .Basic instructions of cylinder head porting to increase horsepower Popular Hot Rodding Magazine.
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