if ter ▁for ▁the ▁Tur bo ▁H yd ra - m atic ▁ 4 0 0 ▁transmission . ▁The ▁sole ▁engine ▁offering ▁was ▁a ▁ 4 5 5 ▁cub ic - inch ▁Ro cket ▁V 8 , ▁with ▁four - bar rel ▁car b ure tor ▁and ▁dual ▁exhaust s , ▁with ▁the ▁ ▁L 7 5 ▁U ▁code ▁engine . ▁Also ▁available ▁was ▁the ▁L 7 7 ▁V ▁code ▁ 4 5 5 ▁with ▁ ▁available ▁only ▁without ▁air ▁condition ing . ▁Although ▁Pont iac ' s ▁SD ▁ 4 5 5 ▁cub ic - inch ▁engine ▁last ed ▁one ▁more ▁year ▁with ▁, ▁Old sm obile ' s ▁high ▁performance ▁ 4 5 5 ▁engine ▁would ▁only ▁last ▁one ▁more ▁year ▁cul min ating ▁with ▁the ▁L 7 6 ▁option ed ▁ 4 5 5 ▁W - 3 0 ▁Hur st / Old s ▁in ▁ 1 9 7 4 . ▁ ▁The ▁' 7 3 ▁model ▁was ▁the ▁first ▁Hur st ▁Old s ▁to ▁be ▁offered ▁in ▁two ▁color ▁schemes - black / g old ▁or ▁white / g old . ▁ ▁A ▁grand ▁total ▁of ▁ 1 , 0 9 7 ▁Hur st / Old s ▁were ▁produced ▁for ▁ 1 9 7 3 ▁with ▁about ▁ 6 0 % ▁being ▁white / g old ▁and ▁about ▁ 4 0 % ▁being ▁black / g old ▁under ▁option ▁code ▁W - 4 5 , ▁ ▁unless ▁ordered ▁without ▁air ▁condition ing , ▁which ▁was ▁option ▁code ▁W - 4