I was digging around for info on the Comp Hi-Lift series for Mopars for my 440, mainly the 285HL and found posts where people had their pushrods being flexed by the aggressive fast ramp of the cam, some to the point of actually coming out of the lifter plungers. Maybe even with the extra clearance the push rod simply can't cope with the ramp and is still flexing to the point of rubbing or ticking when it contacts the plunger over and over? Not sure, but I am to the point of forgetting the HL cams.
