MerCruiser Alpha One 6cyl 4.1L 165hp GM 250ci Rocker Cover Valve Head 65636 I6 Complete Upper & Lower Gearcases OMC engines generally used a

OMC engines generally used a different timing chain sprocket and they also didn't have the coupler studs

1973 1974 1975 1976 1977

This particular unit is from 1985 with the "silver" paint

please ensure the casting numbers are the same or equivalent

This one has casting number 818763C1 (818763-C3 is another common stamping) The other type of bearing carrier MerCruiser used (On Alpha One Gen I & MR lower units) had casting number 73020-C which is NOT the same as this one as it doesn't have the spot for a Locating Key for the bearing carrier

MerCruiser Alpha One 6cyl 4.1L 165hp GM 250ci Rocker Cover Valve Head 65636 I6 Complete Upper & Lower Gearcases OMC engines generally used aItem 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