In terms of boost, the kit was supplied with a six-rib, 3.33-inch blower pulley and a 6.00-inch crank pulley. This combination netted a peak boost pressure of 6.1 psi on our stock motor.

Testing Vortech Superchargers’ V-7 JT and V-7 YSi on a Ford ... we had picked up nearly 38.8 horsepower per pound of boost. With our smallest 2.85-inch pulley the Aluminator soared to 905 ...

Testing Vortech Superchargers’ V-7 JT and ... intake manifold and camshaft configuration was limiting our ability to rev the engine and subsequently make more boost. The 2.85-inch pulley netted ...

With the box-stock 3.60-inch diameter pulley we were able to make 731.5 horsepower and 569.5 lb-ft of torque with boost at 9.3 psi. Sizing down to the 3.125-inch pulley, power jumped considerably ...