Chevy GM LS LS1 LS6 UnderDrive Fluid Damper Harmonic Balancer SFI 18.1 The Speedmaster valve locks will

The Speedmaster valve locks will fit any Speedmaster 10 degree retainer and are recommended for all race applications due to their superior strength

5" axle features an 8

The internal components are made from EN36 Material as used in racing

they yield better fuel distribution and ultimately greater horsepower

heat-treated to the highest Rockwell hardness available

Chevy GM LS LS1 LS6 UnderDrive Fluid Damper Harmonic Balancer SFI 18.1 The Speedmaster valve locks willUsing only three parts a laser welded sealed housing, an internal inertia ring, and highly viscous silicone fluid between the two these SFI approved Fluid dampers can control all crankshaft vibration, not just a limited frequency range. As a result, you get reduced wear on the main bearings and timing gear, more stable valvetrain operation, and less chance of crank failure.