Quote:
Originally Posted by X-TECH MAN
I believe the ones that were caught earlier this year were stamped but NHRA was aware of this trick for years when one of Warrens 350 Camaros was found to have Crane 1.6 rockers on it and using an undercut cam to make the lift check right. It changed the opening speed of the valves more than anything.
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On the old Challenger we would shim the rocker stands to get the cam to check. It would change the geometry. I would think there are to many variables. If they check the lift at the cam there is no push rod flex ETC. And that can make a diffence especially with todays valve springs.