how far back is your motor set? the correct height is for every 1 ft back from transom to the lower unit your cav plate should be 1 inch above bottom of the boat. is it a 20 or 25 inch motor? if it's a 20 inch you will have the small gear case, is it a 13 or 15 spline prop shaft? if it's a 13 spline then the 13 1/4 x 15 in stainless would be a good prop. if it's the 15 spline larger v4 lower unit then a 15 x 15 would be a good place to start.
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1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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