MerCruiser 936-3549 GM 3788519 120hp 2.5L 4 cyl Cylinder Head OMC Stringer 64-72 Starters & Alternators This was off a Crusader

This was off a Crusader Marine Engine 454 CDI 350Hp V8 Model # CH 350 L

1976 1977 1978 1979 1980 1981 1982  Alpha One 470 4-cyl 170hp 190hp 3

but I'm still unsure

You get the set/pair as pictured

MerCruiser 936-3549 GM 3788519 120hp 2.5L 4 cyl Cylinder Head OMC Stringer 64-72 Starters & Alternators This was off a CrusaderItem Details Commonly Found on MerCruiser & OMC GM 2. 5L 120hp models before 1972 Cannot be used with 3. 0L 140hp models Really Great shape, No cracks or welds. MerCruiser 936 3549 936 2284 Technically Can be used to replace 936 5319 if you use the correct style of spark plugs (Champion RN5C) This is the early Pre 1972ish style that takes the "gasket crush washer" spark plugs (13 16" socket rather than 5 8") MerCruiser serial numbers 3825578 & Below