One more great reason to run a lifter valley baffle. I had a motor (396 BBC) that broke pieces off the valve spring's inner dampner springs; on three different valves. Also lost the top part of a polylock with the set screw still in it. All these parts were sitting on the lifter containment /
oil baffle tray. The motor had run great for over 40,000 miles without any real loss of performance, so I didn't even have the valve covers off after the third month. Those were all low perf factory parts, but now I always run matched cam / springs, I just over worked those stock parts.