10’s of thousands of heads are pulled out of the box every year and ran, mostly with good results. Would I do it?? ? Heck no but then again I can check my own stuff. I had a buddies set of ProMax small block heads partially apart and was impressed enough to call him and talk to him. They are bought as rare as possible and done in-house but then again this was 4-5 years ago. The valve jobs and guilds were beautiful on these heads but I didn’t check every hole as it was a freebe job. TrickFlow stuff is very nice too but someone on this site just found a crack