What is the Spark plug gap for a 350 Chevy 1989 Suburban?

The recommended spark plug gap for a 1989 Chevy 350 Suburban depends slightly on whether it has electronic ignition or points ignition and the specific spark plugs used. However, a gap of 0.035" to 0.045" inches is generally considered correct.

To be absolutely certain, you should:

1. Consult your owner's manual: This is the best source for the manufacturer's recommended gap.

2. Check the spark plug box: The recommended gap is often printed on the box of new spark plugs.

Always prioritize the information found in your owner's manual or on the spark plug packaging over general recommendations. Using the incorrect gap can lead to misfires and poor engine performance.