MerCruiser Chevrolet GM 336781 BBC Cylinder Head Assembly V8 454 7.4L Oval Port Heads so more details for compatibility

so more details for compatibility will be added later for those of you that don't have access to the parts diagrams

just ask or check out a parts diagram

Includes key switch with key Mercury 30590

273000022 Housing 2 barrel

please ask if unsure

MerCruiser Chevrolet GM 336781 BBC Cylinder Head Assembly V8 454 7.4L Oval Port Heads so more details for compatibilityPart 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