MerCruiser Chevrolet GM 336781 BBC Cylinder Head Assembly V8 454 7.4L Oval Port Heads 273000022 Housing 2 barrel

273000022 Housing 2 barrel

15hp outboards

please ask if unsure

more-so for the late 80's models

1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982

MerCruiser Chevrolet GM 336781 BBC Cylinder Head Assembly V8 454 7.4L Oval Port Heads 273000022 Housing 2 barrelPart Number(s) Included GM 336781 Cylinder Head Assembly (Tapered Spark Plug holes Large Oval Intake Ports Heat Crossover) should be similar to the 049 & 186 cylinder heads) (73 90 Mark IV 10 Bolt Timing Cover 2 Piece Rear Main Seal Flat Tappet Engine with 2 bolt or 4 bolt main blocks with 289 casting number) Compatibility Generally, the best practice is to just match your existing casting numbers. Other Information Overall good condition, visually