I dropped the heads off at the machine shop and was told the following: The valves that were to have been new, probably weren't. They were stock valves. The 3 angle valve job was done by hand. The retainers were mix matched, probably whatever was laying around. The studs being pinned, really isn't done much anymore. So that blows the idea that the engine was built by a true chevy pro. I am considering pulling the bottom end out and taking it to the machine shop. Who knows whatelse they'll find. I was told that they have seen alot of crap being bought from E Bay. Buyer Beware!!!!