Inside A 440-Cubed 400 Part I
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5. After the heads were pulled, the combustion chambers were inspected for anything unusual. There will usually be a ton of assembly lube in the combustion chamber on a fresh motor--this is from the initial lube of the valve stems and guides. From a wear standpoint, both the heads and the valves were fine, but they were a little too clean and the valves were light-colored, indicating a lean condition. Since this motor dynoed with 108-octane fuel, it appears that the mixture needs adjusting. Erney also pulled the valve springs and checked for lost pressure after the dyno runs. The Crower springs were accurate to their 187-lb. installed pressure before they went on. They now measure 180 lbs. after the dyno session, indicating an expected seven-pound loss on this engine, which is normal. View Related Article
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