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Message: <blockquote data-quote="96blak54" data-source="post: 1226156" data-attributes="member: 14727">Thanks for the history recap, I was there along they way too. Johnny Langton .K.Danner, Nick Mckinny...etcOnly problem is, no one has presented a know how of the potential the heads have in store with just a little port work. The PI head explosion was a simple upgrade over all the stock npi setup, but compresion was the biggest gain with the swap. And yes both heads have different flow characteristics, but can flow equally. The pi intake is still a proven intake for any modular head.You have those that want proven results simple like a pi swap and those that want to keep what they have and improve on it. Me personally,  I just want to have fun building junk yard engines mostly because the price is right. With this said, I figured others would be interested in what it takes to open npi heads up safely.</blockquote>