About the prop question you answered. My boat is a 21 foot sportcraft. 4500 pounds. Would switching to a 16 inch from a 15 inch help push that big boat any better. The engine is only putting out 175 hp. It runs 32 mph with a 15 x 17 prop . It seems to take for ever to plane out.
We took my brothers boat out this weekend. Hand held GPS read 68 mph. 454 chevy, bravo drive coupler. Engine only turning 4200 rpms with a 14" x 21 pitch prop.
My brother is buying a 87 checkmate with a 454 400hp and it has a alpha drive instead of a bravo. this is the third drive put on the boat. Can you bolt a bravo drive on after removing the whole assembly, or is there drilling envolved ?