It is a triple groove pulley - it is a two piece pulley, a two groove and a one groove set that fit together perfectly to form the three groove. The 3 Groove pulley is often needed when doing both air conditioning and power steering.
FOR SBC SMALL BLOCK CHEVY SHORT WATER PUMP SWP ALUMINUM ALTERNATOR BRACKET KIT
Small Block Chevy Short Water Pump BLACK Alternator Mount Bracket Driver Side
Aluminum SBC Small Block Chevy Short Water Pump Single Groove Pulley SWP Natural
1:1 Pulley Combo, With Belts, Fits Small Block Chevy Short Pump
Chrome 3 pulley set for small block Chevy short wp pulleys SBC for ac and ps
