Designed for the 1963-74 Chevy 230/250 C.I.D. 6 cylinder engine to mount a standard case GM alternator and a Saginaw power steering pump with early attached reservoir. Works with factory single groove balancer and water pump pulley. A two groove power steering pump pulley (see related items) will be required for this application to drive the alternator. WILL NOT FIT FULL SIZE CHEVROLET CAR (Impala, Bel Air, Chevelle).