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Has anybody run these "fully ported" 906 heads on the same flowbench as the OOTB Stealth heads? Seems like an awful lot of conjecture going on here. I've seen "fully ported" 906 heads that flow 30 cfm less than a good (280 cfm) OOTB Stealth and ones that flow 60 cfm more than a good OOTB Stealth.

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I've done the A,B,A testing on the big valve ported 906 heads compared to a set of OOTB Eddy RPMs, the Eddy heads went faster in my Duster The ported big valve 906 flowed 266 CFM@ .600, th Eddy RPMs flowed 287 on the same bench by the same tech. three months later, not 296 CFM as advertised The newer Stleath castings are suppose to be as good or maybe a tiny bit better now than the originals Eddy RPMs where Tell your friend to save his money for a set of new M.W.size port heads and intake