M8 8mm Base to 3/8" Rocker Arm Screw In Stud Kit (1.380" Above Hex) Chevy GM LS These Speedmaster cast crankshafts are

These Speedmaster cast crankshafts are perfect for mildly built street engines or just to replace stock crankshafts that have seen better days

and drag racing

500 RPM for explosion proof racing application

Supercharger idler pulley stand ensure optimal belt tension and alignment for smoother power delivery

M8 8mm Base to 3/8" Rocker Arm Screw In Stud Kit (1.380" Above Hex) Chevy GM LS These Speedmaster cast crankshafts areSpeedmaster arm stud kits are made of 4140 Chromoly steel. They're roll threaded, heat treated to a maximum strength of 190,000+ PSI. and have a black oxide corrosion resistant finish. They feature larger radius stud fillets for extra strength.