I finally sent my K341 off for a valve job. I requested that the seats be ground, valves ground, and lapped. Got it back and put the valves in (sent block and valves without keepers on them). Sprayed some WD40 on the valves and stuffed a rag in the intake and blew some air in it. I had bubbles all around the valve. Same on the exhaust side.
I stopped back by NAPA, they sent it off, and talked to them about it. They got the machine shop on the phone and let me talk to the machinist. He said that he did the work and that I was over pressurizing the underside of the valve causing it to lift and let air out. (First he told me to reset the clearance, already did that). He was nice enough and what he said made sense, but I have read too many stories of people using the same method and not having any bubbles.
What else can I do to check the seal? I dont want to put the motor back together only to find out the the valve job is bad. The guy at NAPA told me if I wasnt happy he would make it right one way or the other.