To Calculate the maximum speed of your Supercharger's Impeller (Power Steer Gilmer Drive Only):
Maximum Impeller Speeds
Vortech V-3 Sealed Unit (CAPA Oil System) - 50,000rpm
Vortech V-3 Oil Feed & Drain w/ Air Assist - 58,000rpm
Ratios
Vortech w/ Helical Cut Gearbox (eg V-2, V-3) - 3.6:1
Vortech w/ Straight Cut Gearbox (eg V-1, V-7) - 3.45:1
Crank Pulleys
VT-VZ LS V8 Factory (P/N: 1480ST) - 7.52
VT-VZ LS V8 Race (P/N: 1480SS) - 7.36
Notes:
For LS-1 8-Rib Power Steer Drive and Crank Drive Kits, please use the Supercharger Speed Calculator (Link).