Pulley alignment is very important, especially when the engine is run at 6000 RPM (revolutions per minute) and above. These shims are designed to properly align the pulleys so the belts will stay put.
Product Features:- Fits Most Chevy and Ford Water Pumps
- Fits 5/8" & 3/4" Center Shaft on Water Pump
- Install Between Water Pump & Pulley