Manifold

[Cbitz233]

So pulled my exhaust manifold and notice what looks like one of my valves is possibly burnt. It's black and the wall around it is black. The other 3 just have normal carbon deposits. Is this possible case of burnt valves?

[PackardV8]

Burned valves are more likely to be red than black.  Black color is an indication of ignition or carburetion problems causing incomplete combustion or a rich mixture.

A burned valve can best be confirmed by a compression test and a leakdown test.  Run a compression test on all cylinders.  If one is low, then run a leakdown test and listen for where the air is going out.

jack vines