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Speedmaster direct drums are designed to prevent slippage and are able to withstand strong shifts on high horsepower applications
562" (40mm) axle shaft
but it also extends the life of the clutch
They feature aluminum construction and provide double rate cooling due to the double pass design
the increased diameter applies more clamping force on the second gear clutch pack
Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 Speedmaster direct drums are designedSpeedmaster 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
