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Message: <blockquote data-quote="Mystic SVT" data-source="post: 1255767" data-attributes="member: 12909">C heads are def better than B heads and have a lot more choices of intakes and can of course run intercooled kenne bell/whipples on them.As far as what you said about running GT500/GT/Navi heads, well thats a problem on a 4.6L. They are too much head for a 4.6, but if you're building a high compression BB 5.0 or a BB/S 5.3 then the GT500/GT heads would offer more power gains but then you run into the problem of finding an intake for them. As far as running those heads on a 4.6 based block you only have on real intake optioin and that is the FR500C intake which will cost as much as the GT500/GT heads (ask me how I know). The navi heads aren't that good of a head for a 4.6 because the intake ports are too big, they are made for the 5.4's air needs. You can use adapters to run Cobra/Mach intake on the heads but why spend all that money on those sweet heads only to choke them with those intakes.Running the GT500/GT heads on a 5.4 offers you two options for intake setups...Cobra R lower/upper or GT500 supercharger setup.</blockquote>