Mopar 5.7L Hemi Harmonic Damper - SFI

The Mopar 5.7L Hemi Harmonic Damper from Professional Products is engineered for builders and enthusiasts who demand precision in high-revving Gen III Hemi engine builds. This SFI 18.1-certified damper eliminates the guesswork from crankshaft harmonics, stabilizing destructive vibration frequencies that can crack journals, destroy bearings, and shorten engine life. Whether you're restoring a classic Mopar muscle car, building a street performance engine, or preparing a race-spec platform, this harmonic balancer protects your investment while preserving accurate ignition timing—critical for both carburetor and fuel-injected applications.

Constructed from steel with a black powdercoat finish, the damper features a 6.800-inch outer diameter and external balance design, matching OEM specifications for Gen III Hemi engines. The elastomer ring absorbs peak vibration loads across the entire RPM band, reducing stress on the crankshaft and timing chain while maintaining a tight tolerance fit on the crank snout. Its SFI 18.1 certification ensures compliance with high-performance and racing standards, meaning you can confidently run this damper in sanctioned competition or demanding street builds without compromise. The 10.1-pound weight is optimized for the 5.7L displacement class, avoiding the rotational inertia penalty of oversized balancers while delivering measurable durability gains.

This damper is ideal for 2003–2008 Dodge Ram, Charger, Magnum, and Jeep applications using the Gen III 5.7L Hemi engine, as well as race-prepped variants and crate motor builders. Installation is straightforward on stock or modified crankshafts with standard snout geometry; verify crank key and snout diameter before ordering. Pair it with a quality serpentine belt system and timing cover gasket for a professional rebuild, and expect improved throttle response stability and reduced torsional vibration feedback at sustained high RPM.