No problem boys, hope it helps.
Big thanks to Freddy Rinaldi at Engine land In Elizabth NJ, who happened to have a tray of them in the back.
He has really got it going on there, in his Commercial Engine shop... best around.
And Karen out at Intraco corp in the great state of Michigan for the specs. EXTREMELY helpful ! Good people there man...
Anyways, with " these stock lifters" they should be good the way they are. Or for performance applications... easily converted to a solid lifter with an aluminum plug and a heavier duty snap ring to replace the weaker wire snap clip in the stock lifter's. Or just replace that stock wire clip with a snap ring , and run 'em with oil in them, slight preload on the lifter. So if they DO pump at higher rpm's... it will be for a limited distance open and limited time. The snap ring should also limit the travel a bit more so then the stock wire clip. Or hell.... a spacer could be made to cut the plunger travel in half , and make a "Hydro-solid " Lotta options with the stock lifters....