SBM 7.074 Harmonic Damper - SFI

The ATI Performance SBM 7.074 Harmonic Damper with SFI 18.1 certification is a precision-engineered crankshaft damper built for small-block Mopar engines requiring internal balance configuration. This 7.074-inch outside diameter damper combines aluminum and steel construction with a black finish, delivering the vibration isolation and rotational stability critical for high-performance and racing applications where engine longevity and reliability are non-negotiable.

Harmonic dampers reduce torsional vibration generated by crankshaft rotation, which can lead to premature bearing wear, timing chain failure, and internal engine damage if left uncontrolled. The SFI 18.1 rating confirms this damper meets professional racing safety standards and is approved for sanctioned competition use. The internal balance design integrates counterweight mass directly into the damper assembly, ensuring compatibility with small-block Mopar engine blocks that were originally balanced for internal configuration. ATI Performance's construction methodology uses proven materials and manufacturing tolerances to maintain consistent vibration dampening characteristics across repeated heat cycles and sustained high-RPM operation.

This damper is engineered for builders and enthusiasts restoring, modifying, or racing small-block Mopar platforms—including 318, 340, and 360 cubic-inch variants. Whether you are building a street performance engine, preparing a vehicle for track use, or replacing a worn factory damper, the SFI certification and internal balance specification ensure you are installing a component that meets modern racing standards and engine protection requirements. Proper damper selection is essential when upgrading ignition timing, increasing boost, or running higher RPM limits, as these modifications amplify crankshaft stress.