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Available on '71-'72 TAs was the LS1 455 HO. It was rated at 335hp gross and 305hp net with a stout 480 lb-ft of torque on hand at 3,600 rpm. It used the same heads, 2.11/1.77 valve sizes, and cam as the 70 1/2 Ram Air IV 400. If you're really Jonesin' for more Firebird info, check out "Fire Breathers" in the May '97 CC.