looking for any suggestions/ past experience about this
We've been chasing an issue for a while now with loosing valve lash ( this time after only 3 laps).
I't happened on us with 2 different pairs of heads (RHS RR23, and Dart Iron Eagles), 2 different blocks (Dart and OEM 010) , 2 different cams (comp and now Jones both solid about .620 lift) Ti and or stainless, used 11/32 stems, 7mm stems. 5/16 stems, .600 long on the RR 23's to .100 long on the Darts, Valve brands have been Ferrea, Si, and Manley, all the same result, it beats the keeper groves up till it slips up the stem.
Different springs, keepers and retainers
Jesel shaft rockers, Jesel belt drive
good fuel, and only 32-33 degrees timing.
no tulip on the valves, it just beats up the valve grind angles till they ride a little deeper in the seat
completely frustrated