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INTRODUCTION
The information and plug data provided are for engine builders and tuners as they are continually making engine modifications that alter their spark plug needs. The information provided is to aid in selecting high performance plugs according to their construction features. There are specifications for thousands of spark plugs listed in this look up, the three primary construction features to consider to begin narrowing down your choices are:
1 Shell construction (diameter, reach, seat type, hex size),
2 Heat range,
3 Firing tip configuration (surface gap, recessed or projected tip, fine wire, etc).
There can be other factors to consider in selecting the right plug which include hard engine modifications such as: air/fuel mixture, compression, fuel types, timing, nitrous injection, turbos and blowers, use of high power ignition systems, and racing environment considerations such as elevation, ambient temperature, humidity. We have supplied a brief non-technical overview of each of this considerations as well as some commonly asked questions such as "when are racing plugs necessary?" and “what is a racing plug?” what about indexing, use of resistor plugs, gapping and why you should torque sparkplugs. We hope you find the information both informative and useful.
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