The heads are being put on now

Glad that got resolved for you.

btw, valve piston contact isnt necessarily visible. Interference in the thousandths is all it takes to bend a valve enough so it wont seal properly ever again.

Depending on the dynamics of the valvetrain at 7000, is the spring keeping up, is there flutter (valve not reseating fully), overtravel (valve tip/retainer accelerating past rocker tip), coil bind/rebound, etc collisions happen.

Unless you know that with the retainer absolutely bottomed against the valve seal that it has clearance (claying the motor) from the piston, what can possibly hit will if you find the limit