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May also be compatible with these: 394-2271A2
315930 / 0315931 Cylinder Lift Ring
Rocker Valve Covers: 79961
If you have an Alpha One (Gen I or II)
(228 MIE (4 BBL
MerCruiser 423-3816 Crankshaft 3.0L 181cid 140hp 4cyl N9341352 1972-1989 OMC Bolt Set May also be compatible withItem Details Used from 1972 1989 on virtually all OMC & Mercruiser 3. 0L 140hp 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) This is for engines with a 2 piece rear main seal. which is what they used before 1990 MerCruiser Part Number 423 3816 GM part # N9341352 9341352 (Stamped Cast) Equivalent GM Part numbers (Other common Stamps N9341352 9341352