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The 2-piece rear main seal GM 4
5L V8 460 Ford (1987-1989)
Take a look at your pump and see which style you have
MerCruiser Pre-Alpha Applications 1978-1982 using the EXTERNAL LINE 87173A5 / 87173A10 (stamped 87173A5) Trim Cylinders 120hp / 140hp 4cyl GM
The Sticker in this case only refers to the model above but you could always remove it if yours is cracked and just paint it a solid color
MerCruiser 1623-815822A47 Alpha One Gen II 2 Lower Unit Counter Rotation Gearcase 3.0L 4.3L 5.0L 5.7L Oil Senders Pumps and Remote Filters The 2-piece rear main sealItem Details This is a counter rotating unit. Usually only found on boats with twin engines. Impeller Has been replaced. Compatible with all upper alpha one gen II 2 Units used 1991 & Up Regardless of engine (140hp 3. 0L 4. 3L V6 5. 0L 305 5. 7L 350 V8 etc) Part#s: 1623 815822A7 1623 815822A33 1623 815822A47 1623 815822 C4 Shifts and functions as it should. All shafts are pretty clean and not rusted up. It has been pressure tested Gear oil will be