Single groove. Fits 1965-1966 Ford small block 289.
For 1955-68 Chevy Small Block Edp Black Steel Water Pump Pulley Short (1 Groove)
Fits 1969-85 Chevy SB Small Block Black Steel Water Pump Pulley Long (1 Groove)
Fits 1969-85 Chevy SB Small Block Black Steel Water Pump Pulley Long (2 Groove)
For 1955-68 Chevy Big Block Black Steel Water Pump Pulley - 2 Groove (Short)
Black Steel Water Pump Pulley 2 Grooves for 1965-1969 SBF 260 289 302 351W
For 1965-1969 SBF 260 289 302 351W V8 Black Steel Water Pump Pulley 2 Grooves