* Ignition system: The type of ignition system (points, electronic, etc.) and its condition will influence the optimal gap.
* Spark plugs used: The specific spark plug's design and heat range will affect the ideal gap. The plug's packaging usually specifies a range.
* Compression ratio: Higher compression ratios often require slightly smaller gaps.
* Fuel type: The fuel used can also play a minor role.
Generally, a good starting point for a 454 Chevy is between 0.035" and 0.045" inches. However, checking your owner's manual or the spark plug's packaging is crucial. That information will provide the most accurate recommendation for your specific engine setup. Going outside the recommended range can lead to misfires, poor performance, or even damage to your engine.
If you're unsure, consulting a mechanic is always a good idea.
