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Message: <blockquote data-quote="ivan12" data-source="post: 1025955" data-attributes="member: 10120"><p>I don't see how you could get past the 300 rwhp mark with e7s or even close for that matter even with a 306.  If it were that easy then I'm pretty sure trickflow wouldn't be selling any of their 360 flywheel hp top end kits.  There's plenty of people out there running ported GT40 heads and hitting the 300rwhp mark but these people also port their lower intake, gasket match everything, and have to do lots of trial and error to figure out optimal performance.  Like Rafaelli said, tear it apart, clean the cylinder walls and find a good set of heads I.E. trickflow or AFRs.  If you're set on using a stock head then start with a GT40 head, otherwise you're throwing your money away.</p></blockquote><p></p>