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I began working in an automotive machine shop in 1968 and got the chance to see engines come in and get torn down. On one occasion I saw a 283" that came in that had stiff sludge that filled the valve covers to their tops and sludge that filled the lifter valley all the way up to the bottom of the intake manifold. The valve springs were completely buried under the sludge as were the lifters and push rods that went through little holes in the sludge.

It had been run on 30 weight Penzoil and with NO thermostat. It belonged to a farm worker who never changed the oil or the filter. He just added oil when the level got low. The cylinders were so worn out they required a .060" over bore for its FIRST bore job. The crankshaft had to be ground .020"/.020" because a .010"/.010" wouldn't clean it up. From the amount of wear it HAD to smoke like a freight train.

Something I'll never forget.
 
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