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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
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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
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street454
    
Thank you! Correct information is always a good thing! Mark
posted:  March 6, 2010
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