i have a 24 ft chris-craft with a bravo 1 on back . i just bought boat and ugly weather keeps me fron taking it out for first time . the engine is a 30 over 454 with new turbo pistons in it. my question is : it has the gale banks 330 mercruiser twin turbos on it. when speaking with prev owner who said at 3500 rpm he gets about 6 to 7 lb of boost. boat seems to top out at 68mph. with the cylenders being larger can the boost be raised ? in the instructions i dont see anything about a timing retard box or anything. being new to turbo motors i would rather learn then scatter it . so i come to the pros.. please any help would be great . i e mailed banks turbo and never got back to me . thanks dan :idea: