MerCruiser 4cyl 470 170 170hp 3.7L Rocker Valve Cover 41638A1 41637 1983-1986 Trim Parts Mark 30 Mark 28 mark

Mark 30 Mark 28 mark 30h mark 55 mark 55h Mark 58 Mark 75 mark 75h mark 78 mark 78h Merc 400 450 500 650 700 750 800 850 900 950 1000 1150

Worm Gear 313234 / 0313234 (1968-1980)

note that these are for V8 models because of the installed opposing water outlets

​​​​​​​Seemingly there are multiple part numbers of motors that this is mentioned

but the flanges all look pretty clean yet

MerCruiser 4cyl 470 170 170hp 3.7L Rocker Valve Cover 41638A1 41637 1983-1986 Trim Parts Mark 30 Mark 28 markItem Details Removed from a 1983 1984 MerCruiser "470" (170hp) 3. 7L 4cyl 2BBL (SN 6890474) Overall Good Condition, original paint Parts Included MerCruiser Cylinder Head Valve Rocker Cover 41638A1 (Stamped 41637) This particular one was only used on 2bbl models as well as the 4bbl models with the 98348 C1 intake manifolds as these had the provision on the top for a stud for the 4BBL carburetors The 488 models had a different valve cover, but could be