Pulley Shim Kit Crank

The Pulley Shim Kit Crank by Allstar Performance is a precision crankshaft pulley spacer set designed for Chevy V8 engines requiring accurate timing belt or serpentine drive alignment. Serious engine builders and mechanics trust this kit to correct pulley offset issues that arise during stroker builds, cam timing adjustments, or when upgrading to aftermarket harmonic balancers. Improper pulley alignment leads to belt tracking problems, premature wear, and potential accessory drive failure—making proper shimming essential for reliable long-term engine operation.

This three-piece aluminum shim set provides offset options of 0.063 inch, 0.078 inch, and 0.125 inch thick spacers, allowing fine-tuned adjustment between the crank hub and harmonic balancer or pulley assembly. Manufactured from durable aluminum and finished in natural appearance, these shims distribute load evenly while maintaining precise concentricity—critical for minimizing vibration and extending belt life. The compact profile weighs just 0.35 pounds total and fits within standard 5.5-inch diameter pulley assemblies, making installation straightforward during engine assembly or rebuild work.

Professional engine builders, performance shops, and dedicated enthusiasts running modified Chevy V8 powerplants benefit most from having this stackable shim kit on hand. Whether you're dialing in a big-block stroker, installing a serpentine conversion on a classic small-block, or correcting timing-chain-to-accessory-drive geometry during a complete rebuild, these shims deliver the adjustment range needed without custom fabrication. Compatibility is universal across Chevy V8 applications where pulley offset correction is required—verify your specific harmonic balancer bore and mounting configuration before installation.