i can see that as piston hitting the head will beat the rod bearing up and may stick the ring .
Valve too head clearance
Considering the stockers float the valve till it kisses the head , its free to drop back into the free space . Where as the high lift cam is in constant contact with the lobe .
Collision here will bend the valve .
^ Yep. Less that .035" quench seems to hurt performance (upper power band) in my experience. That's why I settled on that.
For valves, it's as long as they don't hit. If it's a big lift cam, you had better not be kissing the head. We routinely valve pocket the heads for big lift cams so that they do not hit. Actual clearance above the valve doesn't seem to matter, as long as it doesn't hit. Another thing to consider is if you have any valve float at all and how heat affects the clearance. Better to be safe than sorry.
Replace springs, rod bolts, and bearings every race (or two) if you're going to spin them up to 10g's.
They'll live a lot longer @ 88-9200, trust me...but man, do they sound (and run) good in the 10s.