Lead and its affect on valve seats is much over worried about and talked about. The only situation where one might see its affect would be on an engine that runs long hours, at high loadings, high rpms, narrow seats and high spring pressures. Otherwise there is no reason to even think about it. Many moons ago I worked at a quarry where they were talked into switching to Dexcool under the quise that it would not ruin bearings if it got in the engine oil. Starting in about year 2 they were loosing radiators to rot as quick as I could get them recored which was a mystery until the guy at the radiator shop told me to get rid of the Dexcool. I wouldn't give Dexcool to an enemy.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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