I just got all of my engine components back from the machine shop and apparently my head (EB stock head) failed the pressure test on the # 1 cylinder. They said that both valves were bent? Weird... I told them I'd take care of it.

A little background > I blew a headgasket a few months ago and decided to rebuild the bottom end. The Headgasket blew between the number 3 and number 4 cylinders. The engine ran great before hand and I'm certain the valves weren't bent at this point. The only thing that was odd was the amount of carbon buildup on the number 1 cylinder.

Anyway, I have a fresh rebuild kit from EB ready to go in.. including a new set of stock valves. > I was under the impression that these could just be dropped in without any other work. I've done some research and discovered that 'lapping' compound or machine work needs to be done.

Is this really necessary? If so, where can I get this and how is it done?