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This is NOT the proper set for a GEN II
20-48219 Check Valve oil Release
54870 Exhaust Manifold rear end cap Replaced by 73813A1
6G5-43810-00 6G54381000 6G5438100000
Sound Absorbing Blanket: 30021
MerCruiser 936-3549 GM 3905998 120hp 2.5L 4 cyl Cylinder Head OMC Stringer 64-72 Flame Arrestor This is NOT the properItem 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