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My valves

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looks like you have some kind of additive in your fuel. or lean condition.

Al

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The exhausts are going to have deposits on and look different to the inlets from the hot gases passing over them.

 

Not sure what you are trying to see by looking in the ports, you cant tell if they worn or need replacing by looking in the ports.   

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Ok, if the valves are staying in spec and not needing shimming then they should be ok. If they are not then remove them to see how worn they are and rather replace them.

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Good for you for tearing into a 4T. Fun project if you avoid common mistakes. Got a manual? You need one, and you need to read it for the component you are on. There is no substitute. This thread is a good compliment, though, and lots of folks willing and able to help. Biggest issues? Timing, torque of the cam cap, cam cap lube, chain tensioner reset. If you avoid screwing up those 4 things, you will avoid the most frustrating problems. As for your current question:

Pics can be deceiving and as mentioned what you are showing us means nothing of diagnostic value. It looks fine. If you have the head off you can do a couple of things without removing the valves. First, send a pic of the top of the head at a couple angles so we can help look for obvious issues. Next, see if the valves are sealing as they are. To do this, set the head right side up so the valves face down on top of a piece of paper and use a turkey baster or syringe to partially fill each side with water. Let it sit for a few minutes, then pick up the head to see what kind of leakage you have, if any. Then dump the water and rinse with WD-40.

Then check clearances. No leaks or minimal leaks with clearances in spec and no deformation of the valves requires no action by you. Clearances out of spec requires shimming, but first let us know what the gaps are now. What is the thickest feeler gauge that fits? Later we can use the gap now combined with the shim size to get a feel for where those valves are.

Do not be intimidated by this. Just don't forget the four biggest issues, and get a PDF full service manual at least. Keep us posted.

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