Butler Performance Inc. - Spark Plugs

Ignition/Electrical - Spark Plugs
Here is an example if you have a question about the heat range on an NGK spark plug.

The lower the #, the hotter the plug is.

(Example- -6 is a hotter plug than -9)

Spark plug gap for Points is .035 and any electronic or MSD is .040-.045

General Guideline- Pump gas street engines would use a -5 to -7 heat range, high compression race engines may use a -8 or -9 heat range, and boosted/nitrous engines may use a -9 or -10 heat range depending on levels of boost/nitrous.

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Here is an example if you have a question about the heat range on an NGK spark plug. The lower the #, the hotter the plug is. (Example- -6 is a hotter plug than -9) Spark plug gap...More Details »
No Image Available
Here is an example if you have a question about the heat range on an NGK spark plug. The lower the #, the hotter the plug is. (Example- -6 is a hotter plug than -9) Spark plug gap...More Details »
Ignition/Electrical - Spark Plugs - Plugs for Edelbrock Aluminum Heads
Here is an example if you have a question about the heat range on an NGK spark plug. The lower the #, the hotter the plug is. (Example- -6 is a hotter plug than -9) Spark plug gap...More Details »

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