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Naturally, the camshaft selection will have everything to do with the power production and personality of the completed engine. We went with a COMP Big Mutha Thumpr hydraulic roller, because the extended duration and tight lobe centers make power and hit with the sound of plenty of attitude. We went with the largest of the three Thumpr grinds-just as we did with our Howitzer 496 big-block. These things work!