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also note the hex distributor shaft that goes into the oil pump
Flame Arrestor Top Cover 43560A5 ( Similar to Aluminum ones Stamped 41595 or 91804)
150-235hp (150hp 155hp 185hp 235hp possibly others)
May Work on These Horsepowers 30hp 40hp 50hp
MerCruiser 45-853647 Alpha One Driveshaft Gen II Lower Gearcase 3.0L 4.3L 1998Up Brackets Braces Levers Linkages also note the hex distributorItem Details MerCruiser Lower Unit Drive Shaft 45 853647 used in all MerCruiser Gen II Sterndrive gearcases 1998 & UP (1. 81: 1 1. 94: 1 2. 00: 1 2. 40: 1) Ratio (which is 3. 0L & 4. 3L) Basically the difference between 45 853648 & 45 853647 is that the 45 853648 was the "heavy duty" version of 45 853648. Dimensionally they were the same otherwise, and the 1998 & up gearcases used a different bearing & retainer on the shaft. This will also replace 45