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WebNov 29, 2006 · Cylinder-head port design and modification has been a source of speculation for as long as there have been internal combustion engines. Because engines are power-making air pumps, airflow... WebNov 17, 2024 · Cylinder head porting is something that you develop with repetition. You make subtle changes and you see if it makes it better or made it worse. Air has to pass … Webcylinder head rebuilding services. We are one of the country's largest power sports cylinder head re-manufacturers. We specialize in CNC-machined valve seat profiles which enhance air-flow and extend valve seat life. Other services we perform include valve seat and valve guide replacement, along with cylinder head porting and flow-bench testing. biothane horse harness for sale