76 50hp crank in a 84 50hp block

7920hpMercury

Petty Officer 2nd Class
Joined
Mar 13, 2009
Messages
111
Anybody ever install a 1976 50hp 4cylinder crankshaft in a 1984 50hp 4 cylinder block? (I obviously have a good 76 crank but a bad 84 crank!!)

76 has a main bearing single row needle bearings (same as crank needle bearings) and the 84 is a double row needle bearings for the main bearing. If you use the correct main bearing raceway, it looks otherwise like it should be ok. Thought?
 
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