The AMS Motorsport Lightweight Crank Pulley is engineered to reduce rotating mass and improve engine response without the drawbacks commonly associated with underdrive pulleys. Featuring a stock-sized design, this pulley maintains proper accessory drive ratios, ensuring factory alternator output and reliable daily performance while delivering measurable horsepower and torque gains.

Manufactured from aircraft-grade aluminum and precision balanced for smooth operation, the AMS lightweight crank pulley is built to ISO 9001 manufacturing standards. A steel sealing sleeve provides a positive sealing surface for the front main seal, eliminating the oil leak issues commonly found with all-aluminum crank pulleys.

Features

• Industry-first lightweight crank pulley design developed and tested for over one year
• Improves horsepower and torque throughout the entire RPM range
• Projected gains of 10+ WHP and torque
• Stock-sized main crank pulley eliminates underdrive-related issues
• Maintains factory alternator output and accessory operation
• Steel sealing sleeve provides a positive front main seal surface to help prevent oil leaks
• Precision balanced for smooth engine operation
• Constructed from lightweight aircraft-grade aluminum
• Manufactured to ISO 9001 quality standards
• Weighs only 1.4 lbs compared to the factory pulley at 4+ lbs
• Laser-etched AMS Motorsport logos
• Black anodized finish for corrosion resistance and a clean appearance
• Featured in Performance Auto & Sound and Modified magazines