SBM 7.3 Harmonic Damper - SFI

The Professional Products SBM 7.3 Harmonic Damper with SFI certification is engineered for serious small-block Mopar builds where vibration control directly impacts engine longevity and performance consistency. Whether you're building a street machine, bracket racer, or high-revving show engine, this harmonic balancer eliminates destructive crankshaft harmonics that can crack blocks and snap dampers at critical RPM ranges. The SFI 18.1 rating ensures this component meets sanctioning body standards for competition use and street performance alike.

Constructed from premium steel with an external design, the SBM 7.3 balancer weighs 10.99 pounds and features internal balance technology that works in harmony with your engine's rotating assembly—no additional counterweight studs or modifications required. The 7.300-inch outside diameter fits standard small-block Mopar crankshaft noses while the black finish provides both durability and a professional appearance in the engine bay. SFI certification guarantees controlled failure mode and material integrity, preventing catastrophic fragmentation should the damper ever reach failure limits during extreme operation.

This damper is the go-to choice for small-block Mopar engine builders upgrading from worn factory balancers or building fresh long-block assemblies destined for sustained high-RPM use. Installation is straightforward on internally balanced small-block Mopar engines, requiring only standard pulley and bolt hardware. Whether you're preparing for dyno testing, drag strip competition, or building a reliable street cruiser that sees consistent throttle application, the SBM 7.3 Harmonic Damper delivers measurable vibration reduction and proven durability across thousands of documented builds.