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