MerCruiser GM 120hp 2.5L 153cid Crankshaft 5743014 OMC Stringer Chevy 4 cyl 2275 Flywheel Housing and possibly OMC & Volvo

and possibly OMC & Volvo Penta

(See pictures)

The vent will be located in the base and should be obvious if you have this type or not

KF9  (and possibly others)

MerCruiser GM 120hp 2.5L 153cid Crankshaft 5743014 OMC Stringer Chevy 4 cyl 2275 Flywheel Housing and possibly OMC & VolvoItem Details Removed from a 1980 MerCruiser GM 2. 5L Used from 1973 1989 on virtually all OMC & Mercruiser 2. 5L 120hp power plants. (both companies used the same GM blocks, but OMC used bolts rather than studs at the end of the crankshaft to hold the couplers on) MerCruiser Part Number 423 2275 GM part # 5743014 Yours should looks just like this. Engine turned over by hand freely before removed. Some surface rust on this in some areas of the cast