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(NOT METAL)
1973 1974 1975 1976 1977
OMC engines generally used a different timing chain sprocket and they also didn't have the coupler studs
310524 / 0310524 Throttle Cam Yoke
MerCruiser Alpha One 6cyl 4.1L 165hp GM 250ci Rocker Cover Valve Head 65636 I6 Complete Upper & Lower Gearcases (NOT METAL)Item Details Removed from GM 165hp 250cid 4. 1L 6cyl various applications 1972 1978 Part number 65636 (Used with Serial numbers 3464448 & ABOVE)<<Your serial number should be on a metal plate near the rear of the block Also note that this one has the vent on it that connects to a hose via the flame arrestor Original paint Aluminum construction Yours should looks just like this. Freshwater Used Part. Purchase with confidence! 1972 1973 1974 1975 1976