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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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