So i have a spun rod bearing so i pulled my engine; upon inspection i noticed the exhaust valves have some buildup on them. Head has been working fine. Should i be concerned about this? Car has 127k miles

 

anyone?

 

There is nothing wrong with the head because of this build up. If you have a spun rod bearing its the bottom you should be concerned about, maybe your pistons making contact with the valves but you need to take the head off to see that or the pistons out from the bottom.

 

Kind of difficult to see from the picture, but if you are leaking oil down the valve stem it may be time for new valve guides and seals. If not a good valve job and clean up of the head would be a good idea before you put the engine back together. Take the head in to a reputable machine shop and they will let you know if work would be required.