MerCruiser 18643A2 18643A5 Alpha One Flywheel Engine Coupler V8 4.3L 5.0L 5.7L Heads 75hp (20" Transom): 1982-1984 &

75hp (20" Transom): 1982-1984 & 1986-1987

See last two photos for reference photos

73999 Flame Arrestor (superseded to 86270 - which looks a bit different but functionally the same)

Fuel Pump Body: 377113

MerCruiser 18643A2 18643A5 Alpha One Flywheel Engine Coupler V8 4.3L 5.0L 5.7L Heads 75hp (20" Transom): 1982-1984 &MerCruiser V6 & V8 (1987 1998) Engine coupler for 14" Flywheels and engines that have a single piece rear main oil seal. If you have specific questions on compatibility, feel free to contact us. This is the 18643A2 Model the A2 Model as the A5 had that tube sticking out of it which covered the yoke shaft. The A2 Model didn't have the greaseable tube, but you can really use either as they are still interchangeable. Sierra 18 2323 equivalent Note the