I would look for an intake manifold leak and also pull the head pan again and do a preliminary check to see if one or more valve guides are excessively worn. You could be leaking air and oil past the guides.
Also check air cleaner to see if the intake pipe is not choked with years of crud
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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