In my experience, what brings out the big bucks is these tractors having the original 2 valve GM engine. These old engines are getting a little hard to find and really make the complete restoration.
The 4 valve DD engines are plentiful and do make some more power. Most true Oliver collectors reduce the tractors authenticity when they see the DD badge cast on the block rather then the original GM badge.
After hearing this I am glad I didn't toss my old engine when restoring my 990. I really think I spent a lot of unnecessary extra cash and time rebuilding a 4 valve DD. I only use my 990 for pulling so the repower was needed.
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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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