Talk about enigne parts being a blur.....I heard this from a NASCAR enigne builder in an interview on one of the speed channels.....He said at 7,000 rpms,each valve opens and closes 53 times a SECOND,man that's fast.... When you get past 6000rpms you better have some high dollar premium parts in your valve train or the cheap stock parts will be in your
oil pan quickly....
I have an old stock steel valve cover that I cut a slot across the top to adjust the rocker arms without spalshing hot
oil on everything within three feet.. At idle the valves do not open and close that fast, but bring the rpms up to 2000 and things pick up real quick,amazing to watch....
One old engine builder described torque and hp this way to me;torque gets your car from 0 to 100 (or whatever speed),horsepower keeps it at that speed....
David