MerCruiser 1547-5523A18 Pre-Alpha One Upper unit gearcase housing Sterndrive Blowers & Vents MerCruiser Part Number 423-2275

MerCruiser Part Number 423-2275

please ensure yours has the stud on the front of the camshaft

Compression Test:

5L (Many of the bolts should be the same for the 140hp 3

This is not compatible with the 2:40:1 Ratio units (2

MerCruiser 1547-5523A18 Pre-Alpha One Upper unit gearcase housing Sterndrive Blowers & Vents MerCruiser Part Number 423-2275Item Description This particular unit has stickers for a Pre Alpha One 888 Ford 302 5. 0L V8 gearcase, but the housings are the same no matter what drive engine you have from that period of 1970 1982 (I 4, I 6, V8 120hp, 140hp 165hp, 2. 5L, 3. 0L 4cyl, 4. 1L 3. 7L 170, 470, 898, 305, 350, etc..) The housing is in good condition. The shape of your case should look just like this. Stamped Part Number is 1547 5523 (sometimes 1547 3917 or 1547 5523 S or