Chrome steel small block chevy pulley set is for long water pump 1970 and later engines with the alternator mounted on the passengers side of the engine originally running alternator & power steering with no air conditioning. Or any SBC that has a long water pump installed and a keyway p/s pump This is a brand new pulley set not reconditioned originals single groove keyway power steering pulley dia 5 3/4 (1977 and earlier power steering pumps) single groove water pump pulley dia:6 1/4 inches double groove crankshaft pulley dia:6 7/8 inches All Three Pulleys For This Price!!!!! Exactly as pictured You can check out all my chrome water pump, crankshaft, power steering, and alternator pulleys by clicking the pulleys link below.