[tommy d]

What would be the most likely cause of our engine chewing up keepers? It's a around 480 cu and we run a Comp Cams flat tappet cam. Sept of last year we caught one before it dropped a valve and replaced them all. Now one year later it happened again and it's on four different valves. I feel like we have used up all our luck and better get on top of this. Most seem to think bad springs are causing float or bad batch of keepers. Opinions? Thanks in advance.