Counterweight - SBF 28oz Fits 34269/34270

The Counterweight - SBF 28oz Fits 34269/34270 is a precision harmonic balancer counter weight engineered for Small Block Ford engines requiring precise rotating mass balance. Developed for engine builders, performance technicians, and serious automotive enthusiasts, this bolt-on counterweight addresses vibration harmonics that occur during high-RPM operation. Harmonic imbalance reduces engine efficiency, accelerates bearing wear, and transmits vibration throughout the drivetrain—effects that become critical in both street and competition applications where engine reliability directly impacts performance.

Manufactured from steel and finished with zinc oxide coating for corrosion resistance, this 28-ounce counterweight integrates seamlessly with Pro Race harmonic balancers (models 34269 and 34270). The zinc oxide protective finish resists oxidation and salt-spray degradation, critical for longevity in harsh operating environments. At 1.28 lbs and compact dimensions of 3.3 x 2.3 x 6 inches, the counterweight mounts directly via included hardware, requiring no modification to existing balancer assemblies. Precise mass distribution ensures the rotating assembly operates within specification, reducing stress on crankshaft journals and extending engine life.

Engine builders and tuners working with Small Block Ford platforms benefit most from this counterweight when upgrading or rebuilding harmonic balancers for forced-induction, nitrous, or high-compression applications. Installation is straightforward—align the counterweight with the balancer hub, insert provided hardware, and torque to specification. Compatibility is limited to Pro Race balancers (SBF 34269 and 34270), making fitment verification essential before purchase. Whether restoring original balance to an aged engine or optimizing a rebuilt assembly, this counterweight delivers measurable reductions in vibration and improved operational stability.