UPS dropped off the parts I needed for my Champion air compressor today and I went right to work installing the new valves. It was about a 20 minute joband when I was done I spun it over by hand noting a hard spot in the rotation. I loosened the mounting bolts on a couple of valves until it freed up. I found one of the valves (exhaust on the high pressure cylinder) had a screw about .030 too long that was contacting the piston so I trimmed it up on my belt sander and reassembled it. It runs like it did before the broken valve with a slightly different sound to it. I am thinking the intake valve was leaking somewhat. Well, I will let you guys know when a rod flies out the side of the block or other catsassterfee happens. Phillips Air Compressor Inc. of Chicago has my nod of approval for having parts guys that knew what I needed without looking in the book and promptly shipping it.