Pulley Shims and Spacers

Getting your belt alignment dialed in has never been easier with the Allstar Performance Pulley Shim Kit for Chevy V8 cranks. These precision-machined aluminum shims let you fine-tune pulley positioning quickly and accurately, eliminating belt wear and...

Pulley misalignment cuts engine efficiency and accelerates belt wear—problems that cost you races. This shim kit delivers the precise adjustments needed to dial in your water pump pulley geometry, ensuring consistent belt contact and reliable cooling...

Crank pulley timing and accessory drive alignment can make or break your engine's performance—even a fraction of an inch matters in high-RPM applications. This 0.062" aluminum shim gives you the precise spacing needed to dial in pulley geometry, reduce...

Crankshaft pulley alignment is critical for belt drive geometry and accessory performance on small-block Chevy engines. This three-piece spacer kit gives you precision adjustment in 1/16", 1/8", and 1/4" increments, eliminating guesswork when dialing in...

Getting your belt alignment dialed in has never been easier with the Allstar Performance Pulley Shim Kit. Whether you're chasing that perfect pulley alignment or compensating for aftermarket component swaps, these precision-machined aluminum shims give...

Precise belt alignment is critical for 302 and 351 Windsor engine reliability, and this crankshaft pulley spacer delivers exactly the thickness you need to prevent premature wear and slippage. Whether you're running a stock setup or a modified engine...

Proper belt alignment and tensioning are critical to preventing premature wear on your water pump and serpentine belt system. The Moroso Water Pump Pulley Shim K compensates for manufacturing tolerances and worn pump shafts, ensuring your pulleys run...