Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 These replacement valve seats are

These replacement valve seats are just like the originals

full nylon braid

these housings tubes are manufactured with

supercharged

Designed for engines producing up to 500hp

Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 These replacement valve seats areSpeedmaster Harmonic dampers feature a bonding process which adheres the elastomer to the i. d. of the inertia ring and the o. d. of the hub, utilizing a strong adhesive along with an improved elastomer to create a much stronger bond. The inertia ring rotates harmonically with the engine and absorbs the torsion vibration from the rotating assembly at any frequency and RPM. It extends the life of crankshaft and bearing which allows the engine to