Thanks sbcguy and Richard, those are very good suggestions. I am also going to dry fit the bare intake onto the heads to see if I can see any difference in the angles. That clay idea makes a lot of sense, Richard. Great writeup.

Jerry. We did suspect the valve seals so we replaced the intake valve seals on those two cylinders a week or so ago. The seals that came off were in good conditon and it made no difference in the fouling. I also question if valve guides could dump the amount of oil we are getting into the cylinders. Literally, if we put fresh plugs in they are black and oily within 3 miles. After about 20 miles the engine starts popping and missing as they are too fouled to fire.

When we pulled the intake tonight the smoking gun was staring us right in the face. The gaskets are oily half way up and are only about 100 miles old. That is a major leak.

As a side question, what sealant do you guys like for intake gaskets? I have been using Permatex Black RTV, but on some sites people say it isn't the best but to use the Grey RTV instead.

Thanks for all the ideas so far, guys. I really appreciate them.

Don