https://th.bing.com/th/id/OIP.G_tT-Z...id=ImgDet&rs=1
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We had one of the Mercruiser 1's. Dad bought a 23' V King new with a 140 io. Rigged at Skyway, built right up the river from Dave's. Little shop right up by 79th st. Broke 3 of those lowers pulling up skiers, no more than my sister & me - about 225 lbs total if we both went. Finally repowered with a black.165 io at Skyway, never had another problem.
...stubshaft lefts? (service gearcases?)...