I don't know how this can happen, overrev or cheap valves? I do occasionally rev it to 6000 rpm



I was running the YS-270 cam with the 105# springs on Mummert's site



1.5" and 1.78" valves made by qualcast, keepers are of the same brand, may be these cheap parts are the problem.

what do you guys think?



all the valves got nicked by the keepers just like this picture, I was going to cut down the guides to install viton seals, but it looks like I need a new set of valvetrain components as well. what a day.