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What is the spark plug gap for a 98 Chevy suburban?

The recommended spark plug gap for a 1998 Chevy Suburban depends on the engine it has. A 1998 Suburban could have a 5.7L V8, a 7.4L V8, or possibly (though less likely) a 6.5L diesel. The gap will be different for each.

You must consult your owner's manual. This is the single best source for the correct information.

Without knowing the engine size, providing the correct spark plug gap is impossible and potentially damaging to your engine if an incorrect gap is used.