I know you can read spark plugs. Wondering if there's a similar technique for valves? Popped the heads on my flathead and noticed the exhaust valve in #1 looked grey. Basically a sort of "fogged" greyish white around the outside of the valve. I've heard before how the no. 1 cylinder sometimes runs lean and in turn gets hot, causes problems with soft header bolts, etc. It doesn't really look like it's in bad shape - but definitiely looks different than the other fifteen.