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What is the spark plug gap for 1999 Chevy suburban 454 duromax?

The recommended spark plug gap for a 1999 Chevy Suburban 454 Vortec (it's Vortec, not Duromax; Duromax is a different engine brand) is 0.040 inches (1.0 mm). Always consult your owner's manual for the most accurate information, as slight variations can exist depending on the specific engine configuration and spark plug type.