This pulley will fit older Formula Ford 1600 water pumps with 1/2 inch diameter shafts. The pumps we currently carry have 5/8 inch diameter shafts and require the .62 Bore Water Pump Pulley (Part No. 166-02-.62).
The 44 tooth size works with our 30 Tooth 1.6L Crankshaft Pulley (Part No. 166-30) on the 1600 engine. Crankshaft pulley and XL drive belt are sold separately.