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Just built a 2.2 liter T motor and it does the exact same thing. I have about 1000 miles on my motor. Runs strong and idles perfect. No smoke except under conditions you describe. I don't think it's valve guides / seals, or it would smoke when decelerating with closed throttle. Ring gaps and cylinder specs were perfect, when I put it together, but I'm now thinking my honing job was a bit too rough for the stock piston rings I used and caused the ring gaps to open up too much after break in. Compression is a bit lower than I like, which seems to confirm this theory. No way to know, without opening it back up, so I'm curious to learn what you find out on yours.
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