Earl's Performance Harmonic Balancer Bolts

Earl's Performance harmonic balancer bolts are precision-engineered fasteners designed for professional engine builders and serious performance enthusiasts who require reliable, long-lasting clamping force on critical rotating assembly components. Built from high-strength 4135 chrome moly steel with a 180,000 PSI tensile strength rating, these bolts are engineered to outlast and outperform standard OEM hardware across race, street performance, and high-output engine applications.

A key advantage of the Earl's harmonic balancer bolt line is its fully reusable design. Unlike OEM torque-to-yield bolts — which are intended for single use and must be discarded after removal — Earl's bolts can be reinstalled across multiple builds and service intervals without sacrificing clamping integrity, reducing long-term cost and downtime for professional shops and home builders alike.

Each kit includes a matching extra-thick, large-diameter washer engineered to improve load distribution across the crankshaft snout, helping protect the balancer hub from concentrated clamping forces. The bolt's extra-tall 12-point head design delivers secure, positive socket engagement, minimizing the risk of rounding or slippage during installation and when using the bolt to rotate the engine during assembly. Both the bolt and washer feature a black oxide coating for corrosion resistance and a clean, professional finish.

Key Features:

• 4135 chrome moly steel construction for maximum strength, durability, and fatigue resistance
• 180,000 PSI tensile strength for reliable, consistent clamping under extreme rotating assembly loads
• Extra-tall 12-point head prevents socket slippage and rounding during installation and engine rotation
• Includes matching extra-thick, large-diameter washer for superior load distribution across the crankshaft snout
• Black oxide coating on both bolt and washer for corrosion resistance and a professional finish
• Fully reusable — eliminates the cost and hassle of replacing torque-to-yield hardware after every service interval
• Rolled threads ensure maximum thread engagement and accurate torque readings
• Engineered for race, street performance, and high-output engine builds

Earl's Performance harmonic balancer bolts are available in multiple configurations to fit a wide range of popular engine applications. Select the correct variant for your specific engine from the options below.