I had a Ford with a driveshaft that was made up of two parts with rubber in the center, anyhow the shaft had come out of faze ever so slightly causing the vibration. My fix was to have a new one peice shaft made and vibration was gone.
I'm still thinking valve stem seels. Quality of parts on those heads is not the best but there's no reason you can't put good parts on. You can change them with the heads on the car with air plumed to the cylinders through the sparkplug holes. But I'd be tempted to pull the heads and look at the...
As you can see any oil on the threads must come from the combustion chamber so the most likly source is the valve guides in my opinion next would be the rings. You could do a compression check but I suspect that the guide seals aren't up to snuff. The no name heads are leaning me this way.
I suppose the oil could be coming from the guides, what type of seals does it have. Maybe you can post a picture of the heads with a valve cover off, detail.
Before I bought my Fairlane I tried to buy a 60 two sedan, it was complete with the exception of the trunk lock cylinder. It was a base model so not much chrome witch makes it easier.
My idea for the car was a street strip car that was probably way past reasonable.
The I6 would have been...
In 61 my folks bought a new Falcon 2 dr wagon, black with red/white interior. As kids my sister and I were all over the upper midwest in the back of the Falcon. I'll never forget the time we came out of a restaurant got in the car and dad keys would not start the car. Ha there was two black...