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Either head will get you 600hp pretty much straight out of the box.

R.

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I cant see a head that flows 260-270 (maybe a hair more depending on the individual casting) to make an honest 600hp (in street strip form as the OP wants), depending on whose dyno...I know what they claim they flow, I also have seen what they flow on a "more trusted" bench.

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I made 615 hp and 580 ft lbs with ported 906s and a solid cam flowin around 273 cfm and went 10.40 s......