Inside the 455 Super Duty
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Long-lead press information released by Pontiac as early as July 1972 stated the SD-455 would be available on a variety of applications. But it appears that as late as mid-March 1973, the SD option was cancelled on all models other than the Firebird Formula and Trans Am. Pontiac Car Distribution Bulletin No. 73-46 dated March 19, 1973, announces the disappointing news. View Related Article
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