Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 all our models include a

all our models include a 0-90 ohm GM sending unit

unlike plastic alternatives

These replacement valve seats are just like the originals

Speedmaster reflex headlights feature a diamond-style lens that diffuses light in a prismatic beam

Valve CoversCover your valvetrain with a set of Speedmaster fabricated aluminum valve covers

Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 all our models include aSpeedmaster 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