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What has you? It would seem to me that we need a tad bit of clarification here in order to provide a semblance of an educated response. It would be ever so helpful to list the symptoms and any attempts to repair same and the ultimate results. Yes, head bolts need to be retorqued after a rebuild and run-in. Yes, valves need to be adjusted after break-in and periodically in the life of the tractor. How often?...when the symptoms occur: low power, missing, rough running, valve noise. The "old gal pukes antifreeze" from where...the radiator neck? What exactly do you mean by low-end torque? Do you mean when you lug the engine down, or at high rpm in low gears, or what? A leaking head gasket might produce white smoke. Have you done a compression check? Is the tractor running hot? Does it run smoothly? Does it hesitate? Does it backfire? When and how extensive was the rebuild? How much have you used the tractor since. What were the first symptoms and how long after rebuild did they occur? Have you checked the radiator for blockage?
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