1970 1971 1972 1973 1974 Corvette A.I.R. smog pump pulley 3917234 AL LT1 ZR1

This is an original 3917234 AL A.I.R. pulley. The AL stamped pulley is correct for 1970 through 1974 high horsepower and non air conditioned 350 cubic inch Corvette applications, including LT1 and ZR1.