Mutha thumpr hydraulic roller cam 3503/29/2024 ![]() The ZZ4 StoryWhen GM Performance Parts decided to create the archetypical crate motor, they didn't undertake the job lightly. A change to the carburetor's power valve may also be necessary if idle vacuum is at or below 7 inches. 570/.554-inch lift), there's only 7 inches of vacuum at idle at 900 rpm, but it has manual brakes. On Hunkins' 496-inch big-block Chevelle, which has the Big Mutha Thumpr (same duration specs as the SBC, but with. Remember that these camshafts will not pull as much vacuum as stock-style camshafts, so if you are running power brakes, check that you have a minimum of 16 inches of vacuum at idle, or the power assist may not function properly-a rude awakening if they fail when you need them most. With the basic Thumpr Cam (PN 12-600-8), a 2,500-plus rpm stall converter is a good idea. 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. ![]()
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