The appropriate spark plug gap for the Chevrolet 5.7-liter 350 V-8 is 0.035 inch. There are several tools you can use to both measure and adjust the gap.
What is the correct reading for spark plug gap?
For most racing applications, you usually want the plug gap to be between 0.020 and 0.040 of an inch. Most engine builders seem to settle around 0.035 of an inch. Factors such as the type of ignition you run, cylinder heads, fuel and even timing can affect how much gap will work best for you.2009-05-29
What happens if the gap is too big on a spark plug?
Excessive spark plug gap results when the voltage has too far to travel. ... Excessive plug gap also results in cylinder misfiring, a possible no-start condition, wet, black or fouled plugs, engine hesitation and rough idle. Excessive spark plug gap also happens as result of normal electrode wear and age.