OMC Stern Drives And Motors 1964-1986 Repair Manual., Page 46Get this manual
GMC INUNE CLEANING
Scrape all gasket material from the gasket surfaceRemove any deposits in the combustion chambers with wire brushT to the gasket surface
R the carburetor, cable, choke line, and fuel lineStuds located along the side of the head support the exhaust manifoidR the nuts from the studs, and the off the manifoldIf any the service is required on the exhaust manifold, see 9, Cooling
INSTALLATION