I stripped the head from the original race motor so we could get it milled. Some of these exhaust valves look kinda rough, but I don't really know what I'm doing. I'd love some opinions from the older and wiser types.
The following picture shows the exhaust valves from 6, 5, and 4. #4 exhaust valve was replaced when the motor was rebuilt in 2004, but the others are of unknown age. My main concern is the ridge above the valve seat surface (which is probably the worst of all on #5, but not present at all on #4).
I'm also mildly concerned about the rust scale on the shank. 5 and 6 seemed the worst in this case, but the others had some as well. The following picture is a closer view of #5 and #3. Could this be the result of a persistent exhaust leak at the manifold?
The intake valves all look good, aside from being pretty gummed up on top. I'm guessing this is due to the motor running fairly rich for most of its history.
What do y'all think, should I replace these exhaust valves? It's a "race motor," but only in the sense that it gets beat on a lot. It doesn't make a hell of a lot power.