Chevy 350 Spark Plug Gap Review In 2023: Boost Your Engine Performance

Chevy 350 Spark Plug Gap Review In 2023: Boost Your Engine Performance
1987 chevy 350 spark plug gap from


The Chevy 350 engine is a popular choice among car enthusiasts due to its power and reliability. One crucial aspect of maintaining this engine’s performance is ensuring the correct spark plug gap. In this article, we will review the importance of spark plug gaps for the Chevy 350 engine and provide tips on how to optimize it for better performance.

Why is the Spark Plug Gap Important?

The spark plug gap refers to the distance between the center and ground electrode of the spark plug. This gap plays a vital role in the efficiency of combustion inside the engine cylinders. An incorrect spark plug gap can lead to various issues, including misfires, decreased fuel efficiency, and reduced engine power.

Optimal Spark Plug Gap for Chevy 350

The optimal spark plug gap for a Chevy 350 engine typically ranges between 0.035 and 0.045 inches. However, it is crucial to consult your vehicle’s manual or a trusted mechanic for the exact gap recommendation, as it may vary based on the specific model and modifications.

How to Check and Adjust Spark Plug Gap

Checking and adjusting the spark plug gap is a relatively simple process that can be done with basic tools. Here’s a step-by-step guide:

1. Start by ensuring the engine is cool and disconnected from any power source.

2. Remove one spark plug wire at a time using insulated pliers.

3. Use a spark plug gap tool to measure the current gap. If it falls outside the recommended range, adjustment is necessary.

4. To increase the gap, gently tap the edge of the spark plug on a hard surface. To decrease the gap, carefully bend the ground electrode.

5. Re-measure the gap after each adjustment until it falls within the optimal range.


1. What happens if the spark plug gap is too small?

If the spark plug gap is too small, it can cause insufficient spark energy, resulting in misfires, rough idling, and reduced engine performance. It can also lead to premature wear of the spark plug and ignition system components.

2. Can I use a different spark plug gap than recommended?

While it is generally recommended to stick to the manufacturer’s recommended spark plug gap, some modifications or specific engine setups may require a different gap. It is best to consult with experts or refer to reliable resources for guidance.

3. How often should I check and adjust the spark plug gap?

It is advisable to check and adjust the spark plug gap during regular maintenance intervals, typically every 10,000 to 15,000 miles. However, if you notice any performance issues or irregularities, it is recommended to check the gap sooner.

4. Can a wider spark plug gap improve engine performance?

A wider spark plug gap can potentially improve engine performance by providing a larger spark area, resulting in better combustion. However, it is crucial to find the right balance, as too wide of a gap can lead to misfires and engine problems.

5. Should I use a feeler gauge or a wire-type gap tool to measure the gap?

Both feeler gauges and wire-type gap tools can be used to measure the spark plug gap accurately. However, feeler gauges provide more precise measurements, making them the preferred choice for most mechanics and enthusiasts.

Leave a Reply