Hello, just bought a 89 Challenger Aerotech super v 24, I understand the original company was in Cedar Springs Mi. This boat is equipped with the Challenger 500 limited edition 454. I have the Feb.1989 Powerboat magazine article where they test the boat. I says they used a modified Mercruiser magnum with modified heads and a special cam rated at 420 hp at 5250 rpm. Does anyone know who I could contact that would know the specs on the camshaft? There is a slight ticking on one side, and before I take the valve cover off to inspect and ck the adjustment, would like to know the specs on the cam. Any help would be greatly appreciated. Thanks