Clicking from #6 cylinder area on 84 930

[hbw727]

Been a good while since I posted here but I wanted to get some thoughts on the clicking noise that's coming from the #6 cylinder area of my 84 930.
I've owned the car for four years and put about 5500 miles on it. It currently has approximately 31.5K. Since I've owned the car it has had a clicking noise that that sounds like a rocker arm . The valves were adjusted on it around 3K miles ago and it helped considerably on all the valves but it didn't get rid of the clicking noise. The guy that adjusted them didn't see anything wrong in the rocker arm area.
When the car is started cold, in the summer or winter, there is no clicking sound until it warms up but the warmer it gets, the louder the noise becomes. If it idles around 900, the sound isn't as noticeable but sometimes, especially in the winter, the idle stays up around 1100 and the clicking is more noticeable.

I had a local Porsche shop, who does complete engine rebuilds, tell me that they are certain that it is valve guides and probably those in #6 cylinder or the one next to it or both. It sounds very quiet on the other side of the engine. I also contacted another shop in TN who does engines and they seem to think that is likely same thing.

Both shops have given me a figure of around 8K to have the valve guides replaced. Basically, the car uses very little oil. I didn't even have add any between the last two oil changes. There is a small amount of smoke momentarily when it's started cold after sitting for a few days. I'm using Brad Penn 20W50.

Would appreciate any thoughts or experience anyone has had with this.

[T77911S]

is 31k the TOTAL milaege?

a valve guide with that many miles IS unusual even though that is what is sounds like.
if it is a guide i would be concerned about oiling.
i would also do a leak down just to make sure the PO did not over rev it or se if maybe something else is going on.
me? i would pull the motor and just pull that one head off if it only has 31k on it and fix the one head or pull 2 heads and have the other one checked. like i said, a valve giude at 31k may be just a freak thing.
a lot will bawk at this and say while you are in there just do the rest. but it also depends on what i find when i went in.