generally, the difference is fairly simple, The marine engines are based on truck(heavy duty) engines with marine specific cam shafts and accessories. The exhaust system is water cooled and is marine specific. Usually, the bigger the engine, the better the mileage, the bigger engine works less to achieve the same speed as a smaller motor. Current marine engines have EFI available. there are a lot of differences iwith the programming in marine efi vs auto efi.
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