King Performance 5.25" Billet Pulley System — Complete Top & Bottom Kit | Air-Cooled VW

King Performance 5.25" Billet Pulley System

For high-performance air-cooled builds where clearance, cooling efficiency, and engine response are critical, the King Performance 5.25" Billet Pulley System offers the ultimate balance. This 100% USA-made kit is engineered for precision, featuring a unique "frenched" design where the high-strength steel hub is recessed into the pulley for maximum stability and a crisp, clean aesthetic.

The "Sweet Spot" Ratio

This kit is specifically designed for the driver who wants the performance of a smaller pulley without the cooling trade-offs. The 5.25” crank pulley paired with the 3.6” alternator pulley brings your engine closer to the original factory pulley ratio.

• Better than a 4.3" Power Pulley: While a 4.3" setup is built for maximum horsepower gains, it often sacrifices cooling and charging at lower RPMs. This 5.25" setup charges and cools significantly better.

• The Perfect Compromise: At 5.25", it is slightly larger than a 3.2" (the "exact" stock ratio), giving you a slight performance edge while maintaining the high-reliability cooling and charging your engine needs for the street.

Engineering & Material Specs

• 100% Made in the USA: Precision-manufactured in-house using premium U.S.-sourced materials.

• Superior Hybrid Construction: Pulleys are CNC-machined from 6061-T6511 billet aluminum.

• Frenched Steel Hub: Mounted on a heat-treated 4140 chromoly steel stock-style hub for lifetime durability and perfect concentricity.

• Hard-Anodized Protection: Finished in a heavy-duty .0015" thick hard black anodizing for extreme wear resistance.

• EFI Ready: Pre-tapped mounting holes designed for immediate use with the Dub Shop Trigger Wheel.

What’s Included

This is a comprehensive installation kit featuring all necessary high-grade hardware:

• 5.25" Billet Crank Pulley & 3.600" Billet Alternator Pulley

• 7075-T651 Hard Black Anodized Nut: High-strength and wear-resistant.

• 6061-T651 Clamp Washer: Provides even pressure and secure fitment.

• Crank Pulley Bolt: High-tensile hardware for a secure installation.

• Precision Shims: Includes .005" thick shims for perfect belt alignment.

• Bonus Item: High-quality belt included at no charge (provided as a size recommendation; actual needs may vary).

Warranty & Notes

• Manufacturer Guarantee: All King Performance billet products and fasteners are guaranteed for two (2) years from the date of purchase.

• Anodizing Note: Finish may naturally fade or change color over time due to engine heat and UV exposure. This is a normal characteristic of the material.