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What is the plug gap on a 91 Chevy 5.7 suburban?

The recommended spark plug gap for a 1991 Chevy 5.7L Suburban (assuming a TBI - Throttle Body Injection system) is 0.045 inches (1.14 mm). However, always double-check your owner's manual for the most accurate information. The gap might vary slightly depending on the specific spark plugs used.