There are 3 different thumper camshafts. By name he just called it a thumper which is the smallest but the part number he listed is the big one. So not sure which one he is referring to.
They have a Thumper, a Mutha Thumper, and a Big Mutha Thumper.
I believe the part number listed in post #1 is the Big Mutha Thumper.
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