I dont think you can get a head to big for a 434. I have 2 of them with dart 230 ported to the max and there is no hesitaton on the bottom end of them. On the dyno they make 472 ft lbs at 3500 507 at 400 575 at 5000 hp was 635 at 6500. The dyno pulls were not to make peek hp we were messing with lifters and oiling problems.
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