MerCruiser 1547-5523A18 Pre-Alpha One Upper unit gearcase housing Sterndrive Blowers & Vents Compression Test:

Compression Test:

Used from 1968-1979 on virtually all OMC & Mercruiser 165hp power plants

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

just message me your year and model number located on the valve cover of your engine and we can make sure this will fit

225 & 250 EFI

MerCruiser 1547-5523A18 Pre-Alpha One Upper unit gearcase housing Sterndrive Blowers & Vents Compression Test:Item 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