However, a range of 0.035" to 0.045" is a common and generally accepted starting point for most 1971 Chevelle 350 small-block engines.
To find the precise specification, 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 packaging of the spark plugs themselves will often specify the correct gap.
3. Look at the engine's decal or tag: Sometimes, engine specifications are found on a decal or tag on the engine itself.
If you can't find the information using these methods, a mechanic specializing in classic cars or a parts store specializing in classic car parts should be able to give you the correct gap based on your engine's specifications. Don't hesitate to provide them with your engine's details (like the casting number) for more accuracy. Getting the gap wrong can affect performance and engine longevity.
