The Poly-Vee water pump drive system uses interlocking grooves and vees (5 grooves in the water pump pulleys and 4 grooves in the belt) for maximum drive efficiency without the harmonic resonances that can affect toothed-belt water pump drives.
This shallow-setback pump pulley is used with the matching Poly-Vee Crankshaft Pulley for Swift (Part No. 176-08) and the 19 Inch Poly-Vee Water Pump Belt on Swift FF2000 / Sports 2000 applications to drive the water pump at 64% of crankshaft speed.