When using the Thumpr camshafts, especially the larger Mutha Thumpr (PN 12-601-8), it's recommended that a 3.55:1 ratio rear gearing and 2,800-plus rpm stall converter be employed to help off-the-line acceleration. But there are a few more things worth considering for your specific vehicle combination. Thumpr Cam ConsiderationsThe Thumpr hydraulic roller cam series from COMP represents state-of-the-art technology with regard to camshaft lobe design and overall timing.
