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Message: <blockquote data-quote="Boomer!" data-source="post: 164346" data-attributes="member: 9720">Wow, I have read this entire thread thinking when is the real point going to come out. Everyone assumes the larger runner of the P.I will make more power, truth be told the P.I actually have a huge flaw which is why they do not make more than the average of 10 rwhp when bolted on to a NPI block. 1. Throw away the numbers in CFM, they are a gimmick to sell you something and are only the basics of airflow dynamics.2. The shortside radius on the P.I head intake runner is horrible and is a restriction 3. Yes, the P.I heads flow higher rates of cfm. The airflow reaches it's chokepoint faster as the higher lift numbers approachon the P.I head. I saw a flow chart posted earlier in this thread that shows this happening. "If" and I say if, the P.I head design was so great why did they not opt. for its runners on the SVO heads ? The SVO heads flow ported better than some of the 4 valve heads do. Out of the box they outflow most any port 2 valve head. Believe what you wish, if you want to take CFM as your only data when puchasing a head let you be the one to get burned.</blockquote>