Heat range should have zero effect on cold starts, idle speed and low load conditions. The heat range is determined by how long it takes a spark plug to transfer heat to the cylinder head. There is not a universal measurement, heat range from one manufacturer can be totally different from another.
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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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