HRL, thanks for the details about the procedure. I was concerned that the Bon Ami was mixed with the engine oil and the affect that would have on all the bearings. Dribbling into the intake makes sense and if everything else fails I may give it a try as a last resort prior to pulling the engine for tear down.
My valve spring compressor is scheduled to be delivered today and I plan to inspect the valve stem seals on cylinder #1 to see if they offer any clues.
