Stealth heads vs Eddy performer rpm

There is a post on BBD about them, at least I think they were the stealth heads, but I can not find it. Guy was having a ton of troubles, looked like it was mostly the machinist, but he ended up dropping a valve, and from what I remember it was from the keepers being the wrong size for the valves that were supplied with the heads....
Yep he is a friend on mine on BBD and it was his fault....the Stealth valve stems are 11/32" and he put on the wrong size retainers and locks and shot a valve into a piston...he sourced the retainers and locks from someone else than 440 Source...they specifically state theirs are 11/32"...others have reported cracks in them...others reported they lost one of the freeze plugs and I remember two of them reporting broken valve guides