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How can I tell if a Super Duty 455 engine is genuine or not?

April 26, 2017duty engine genuine

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How can I tell if a Super Duty 455 engine is genuine or not?

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The Super Duty (SD) 455 was offered by Pontiac in 1973 and 1974. The fifth digit/letter of the vehicle identification number is an ‘X’. A 1973 SD block is stamped on front right (passenger) side with either ‘Z8’ (manual) or ‘X8’ (automatic). The 1974 blocks are stamped with ‘W8’ (manual) or ‘Y8′ (automatic). The heads have a casting of ’16’. Be careful, the 1968 heads were also casted with a 16 but the chamber volume is 72cc (D-port) vs. 111cc (round port) for the SD. Also, the SD 4 barrel iron intake casting numbers are 494405 or 494419 (1973) and 495107 (1974). An aluminum version (casting 485640) was designed, but didn’t make it into production.