I dont think so. I looked them over pretty good before painting them. DS was welded by someone on the past. I think its a lifter or maybe an injector? I did however send them to caspers so they can do whatever they do to them. So..... start over with preload, but go 3/4 past contact? As long as rocker threads are in spec? And, it has been at the same volume from initial start up till now. Not really audible beyound idle. Possibly quieter when i had a qt of lucas in it. Oil is 10/40 royal purple Will a wideband pick up leak in header?