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Whats the spark plug gapping on a 1990 Chevy silverado 1500?

The spark plug gap for a 1990 Chevy Silverado 1500 depends on the engine it has. There were several different engines available that year. You must consult your owner's manual to find the correct gap for your specific engine.

The owner's manual will list the gap specification, and it's crucial to use that exact gap for optimal performance and to avoid engine damage. Trying to find the gap online without knowing the exact engine is unreliable and could lead to problems.