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Message: <blockquote data-quote="BigBore96" data-source="post: 1049404" data-attributes="member: 17566">The NPI heads flow more intake velocity than the PI heads.The NPI's were restricted on exhaust.   Cam it accordingly and be done wtih it.  Do some current research.The PI intake and cams are better than the NPI intake and cams by far.  I'm not saying stick with the NPI intake or its cams.  The intake along with terrible cam specs choke the living crap out of NPI heads.   However....  A Custom NPI cam with a PI intake or better.  Makes solid power.  Look it up.   Doing this is something that has only occured in the last couple years.  So many people are still PI or nothing....  It's simply not the case if you do it properly.And your problem with your old car.   Was the PI cams.   They are better than the NPI ones.  But are terrible in those heads.The NPI heads want a newer style PI or Vic jr intake with some Big nasty cams that you CANNOT fit in PI heads without notching pistons. However these cams fit fine in NPI heads which is where the power comes from. End of story.</blockquote>