Thumper cams?

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go to http://www.compcams.com/Base/MultiM...what the cam sounds like, I have one on order
 
I have 1500 miles on the muthr thumpr full hyd roller. Its a 408 built by Joe Sherman that dynoed over 570 HP. Only problem is it just started having some heavy valvetrain noise and I think there is at least on bad lifter. Joe is going through it now and I should know what happened soon. Joe says he ahs had a few of the comp lifters go bad over the years but it's not common.
 
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