I believe that the first contact will be between the top of the seal and the bottom of the spring retainer. That would be a soft hit and pretty quiet but would chew up the seal. A few thou (?) more would be metal to metal and not so good... bent pushrods, etc possible. Not sure what that would sound like but probably 'clattery' like pumped down lifters.
Valve float normally exhibits initially as a drop in power (valves staying a bit open bleeding off compression) but if pushed much further may end up eventually with valves clouting pistons. Yes, higher revs is where that'd happen. Dependent on springs and camshaft profile for when or if.
DiscoClax
'94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
'08 RRS TDV8 Rimini Red - 285/60R18 Falken AT3Ws, Rock slider-steps, APT full under-protection, Mitch Hitch, Tradesman rack, Traxide DBS, Gap IID
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