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My guess is the head design's breathibility. Lots of aftermarket heads now flow real close or in a few cases better than a (stock) Hemi, but between port size & (opposing) valve arrangement I'd guess there's far less restriction & turbulence inside the chamber than a wedge head. There's GO to be a reason guys like Sonny Leonard are putting hemi heads on GM products now...........
SONNY'S is not putting Hemi heads on GM products. His is a completely fresh design in every aspect and not like a Mopar Hemi
home of the Sox and Martin Hemi Duster
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