It take little coolant to make the white smoke. If you have run it for minutes at a time the level will not go down dramatically. The test is to let it sit for a day then pull the plugs and crank it (ignition off) if coolant comes out, or there is coolant on the plug, that cylinder is leaking. The intake and exhaust ports are in the block. They can crack and leak coolant into the intake or exhaust. If the crack is where the manifold is going to one end of the engine, that end is likely to have the leak. A cylinder leak down test (research) or compression test will also help decide your move. Were it mine I would do both, and the above test. If you run it you will ruin it. Jim
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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