I'm a big fan of the take apart oil filters, you can usually spot something wrong before it happens. I start out with 250 lbs seat pressure on the valve springs and check often, when they drop below 225/230 i change them out. We just pulled down a 434" junk blk, with 200 passes on it, pistons looked brand new leakdown was less than 3% with zgaps, but we did change out the bearings and freshened up the heads. The motor had slowed down about 5 hundreds. We broke 2 rocker studs, during those 200 passes, dragster ran a best of 4.88 and would always run 4.90s hilborn stacks injected alcohol.
JMO
Zip.