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ERA Chas - He mentioned he's running a 428 with the stock Cobra Jet heads is the reason I gave my comparison. The 428/429 CJ heads are what's used on the 460. Maybe I misunderstood the original post or yours, but in either case - he needs more air in or out which will produce more power. Not too much air out as this will reduce torque (the go that get's you there faster). Anyway, my .02 worth, thought it would help. See ya.
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