Marine: Boating, Sailing, PWC, GPS and Navigation - Repairing a Mercury 500 50hp 4 cyl., lower end replacemet

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HotRod53F100
08-30-09, 01:45 PM
This motor is s/n 4803973 which I think comes out to be a 1977. It's a 50 hp 4 cylinder Thunderbolt. The lower unit housing is broken and the prop came out while sitting. Anyone know what years lower unit will fit this? Does it have to be off of a 4 cyl unit and does it have to be off of a 50 hp unit?