Get the recommended spark plug gap for your engine type and fuel.
| Engine Type | Typical Gap | Notes |
|---|---|---|
| NA Gas (stock) | 0.028"–0.060" | Wider gap = stronger spark, better combustion |
| Turbocharged (low boost) | 0.028"–0.032" | Reduce 0.004" per 50hp of boost above stock |
| Turbocharged (high boost) | 0.016"–0.024" | Tight gap prevents blowout under boost |
| E85 / High Compression | 0.028"–0.040" | E85 burns cooler, can use slightly wider gap |
| Race / High Performance | 0.020"–0.028" | Smaller gap for reliability at high RPM |
| Diesel | N/A | Diesel uses glow plugs, not spark plugs |