Challenger Drag Pak Owners

[Rich Biebel]

If the rockers hit the retainers and not the valve tips it will usually cause you to drop a valve from the locks coming loose. It generally does not cause a valve to "hang up". The only instance of valves "hanging up" I have ever seen is from guides that were too tight or over heated and lost lubrication.

Stockers often run some very close P-V clearances and it sounds like you need to be checking this. I would assume these engines have roller cams and I have no clue as to what a redline might be for one. 6800 sounds pretty low for most modern Stockers with the parts that are out there today. If it does have hyd. roller lifters I would assume something else is limiting it's rpm capability.

I am not familair with any of these engines or the valvetrain layout.
Warped valve stems is a new term to me....
Of course with the questionable quality of the parts out there today anything is possible I suppose.......

Your valvetrain is your most critical area in most any race engine and that has always been my view......You break something on top and it often leads to catastrophic failure.....