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The ignition point gap for a 366 GMC engine is typically set to around 0.016 to 0.020 inches (0.40 to 0.50 mm). It's important to refer to the specific service manual for your engine, as variations may exist based on the model year or any modifications. Properly setting the gap ensures optimal engine performance and efficient ignition. Always use a feeler gauge for accurate measurement when adjusting the gap.
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