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Message: <blockquote data-quote="96blak54" data-source="post: 1371935" data-attributes="member: 14727"><p>Flat tops put you in 11.1static area. Dont be affraid to go more if you'd like. Just be sure to get tuned. If you mill the npi heads .100" you gain a quench pad and your static begins to touch 15.1.  im finding the 5.4lnpi heads are the real ticket for npi performance, unless you can score a set of svo heads. The big restritor with the 4.6l npi heads is the exhaust port and intake port entrance. The 5.4l head ex.port is already opened up alot more, but youll need to do surgery on the intake as the entrance is pintched.</p></blockquote><p></p>