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8.1L marine engine (standard or high output) (one-piece rear main seal, roller cam and roller lifters). This engine has been professionally remanufactured to meet or exceed stock GM OEM marine engine specifications. Developed between 370 and 375 hp for the standard HP or between 420 and 425 hp for the high output version. This 8.1L long block will NOT work as a 7.4L replacement.