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I would not want to go 30 over if I could stay at 20 over . The extra cost of pistons will not compensate for the disappointment of over heating like some 30 over 428 engines experience. It is not worth the risk IMO. Don't be penny wise and pound foolish. Randy Gillis ( gt350hr ) on the SAAC forum works for JE I believe. One of the big piston companies anyway. Contact him and see what he thinks and his advice . A very helpful person and he is my Ford engine go to guru .