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Generally this is the result of the installer not porperly degreeing the cam, and more common not setting up the valvetrain geometry correctly. Pushrod length cannot be determined in advance. It can only be done after the heads are at final torque and them proper preload is measured for. Most ues whatever length the cam supplier guesses at and that is a crap shout, so what happens is the lifters get hammered to pieces and then hammer the lobes apart.
Not Comps defect at all, its the installers.
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