Here is a picture of one of the intake valve assembly. There is NO RUBBER SEAL on the valve guide. To me the seal should be on the widest groove which is near the top of the guide.
I do not think it has been a problem for 2 reasons. 1 - These things were pretty darn tight to get out. I think it was sealed. 2 - the top part of the guide is dark where oil/gas/exhaust worked its way down. But below where the seal belongs, the metal on the guide is beautiful and shiny.
Also, look at the intake valve. I think it looks pretty dirty. The exhaust valves and seats look much better and have a metal shine to them.
Would this dirty intake valve be a reason for lost compression? How bad do they have to be to lose compression?
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