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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments            Search Questions:    santo357gmailcom      what do the letters SD onthe hood cowl of a 72 ta stand for?? I saw a picture of a california 72 trans am with the letters SD next to the 455 on the hood cowl,is this a custom job car like a shelby? posted: February 23, 2010       Answers (3)   street454      Super Duty. It was the high horse version of that motor. I think it was a 1 or 2 year only option for the bird. posted:  February 23, 2010   pontiacfan1      Super Duty is the correct term for SD but the Super Duty wasn't available until 1973. 1971-1972 had 455 HO or High Output engines. posted:  February 24, 2010   street454      Thank you! Correct information is always a good thing! Mark posted:  March 6, 2010

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