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checked for cracks
55-58780A 3
56171 Starboard Rocker Cover
1987 1988 1989 1990 Outdrive Sterndrive
They did switch the version of this at some point that had a smaller thread for the oil filter
MerCruiser 222-6355 Flywheel GM 366861N 3.8L 305 350 898 V6 V8 12-3/4" 2-piece Oil Senders Pumps and Remote Filters checked for cracksItem Details Removed from a MerCruiser GM V6 3. 8L 229CID 185hp 12 3 4" Diameter! For 2 piece rear oil seal engines 3. 5" across for the stud mounting holes. Yours should look just like this. PLEASE DO NOT BUY THIS WITHOUT CHECKING THE NUMBER STAMPED CAST ON YOUR EXISTING ONE OR CONSULTING US FIRST. Trust me it will be worth your time and I'll point you in the right direction even if I don't have the right one. 153 tooth unit. Center hole is 2. 5" 12