Re: 1975 SeaCraft CC , 18' ..Transom height change ??
A 25" transom is what you want. Most contemporary outboards are equipped with 25" shafts. 25" measured from the top of the transom to the bottom of the keel. On the motor it is measured from the bottom of the bracket where it mounts on the transom to the cavitation plate on the lower unit. 25" is the "new" standard. 5" more freeboard and a real safety factor. Don't even consider doing all of that work and leaving it at 20".
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