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carlintexas : Well, that kind of tells the story! Dang! Don't guess the billet flywheel makers see a need to disclose that information do they?
Seems I recall a parts drawing of our engine that shows an adjustable balance shaft in the front. Is that correct? If so, can the engine be re-balanced 'in the car'?
My service manual says:
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Important: Do not orientate the flywheel to the crankshaft. It is balanced separately from the engine.
The balance shaft does not address balance issues with the crank/flywheel. It counteracts the vibrations inherent in a 4-cylinder engine that are caused by the movement of the pistons.