GM 378450 MerCruiser 938-7482 Cylinder Head V8 305 5.0L Early 228 1977-1979 Trim Tab Parts Same as Sierra 18-2166 &

Same as Sierra 18-2166 & Mercury 44-824110

This one uses set screws included for installation (missing two set screws)

85hp 88hp 90hp 100hp 110hp 115hp 140hp Possibly others

Inside hole diameter is 1

GM 378450 MerCruiser 938-7482 Cylinder Head V8 305 5.0L Early 228 1977-1979 Trim Tab Parts Same as Sierra 18-2166 &Parts Included MerCruiser 938 6536 > 938 7482 GM Part Number 378450 Compatibility Generally the best practice is to just match your existing casting numbers. Found on MerCruiser OMC GM Chevy V8 305cid 5. 0L 4BBL Models > 228hp & 230hp with 4BBL Intake Models 1977 1979 at the latest as this is an early version of the 378450 (there was a later version with larger valves) Used with the standard 2 piece Rear Main Seal engines. Perimeter Bolt Valve Covers