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Message: <blockquote data-quote="96blak54" data-source="post: 1504849" data-attributes="member: 14727">Oh yeah....one can make the entry point of the npi port very close to the entry of the pi port shape, but thats where it ends. The npi port can not be replicated to a pi port shape. Well...i said cant, but i guess with tons of work include welding, one can replicate the port.You are right, both can be ported to flow the same #'s. This is why i always stress with any given engine, the intake valve size will be your determining hp factor. It is the orfice to the engine.Just remember, The quickest 4.6l 2v that ran mid 9sec quarters at nmra class weight ran a head with a unported npi port.</blockquote>