The gap spec and part number did indeed change, the. 040 is correct. Side note, Delco platinum and iridium plugs should only have the gap inspected, not adjusted. You can damage the tips by adjusting.
Your truck likely needs intake gaskets, they shrink and allow a vacuum leak when very cold. They then seal back after the engine warms for a few minutes. See them a lot in my shop. Not a bad job on that engine, no coolant or distributor to deal with.
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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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