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Answer:All Chevy 350 engines prior to 1986 were internally balanced. In 1986 the 350's changed to a center bolt valve cover, a one piece rear main seal and a different crankshaft. These engines are externally balanced at the flywheel. If you look at the late flywheels you will see a pad of extra metal cast in. The harmonic balancers continued to be neutrally balanced.
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Q: How can you tell if a 350 is internally balanced or external?
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