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- NGK-R5671A-9 is a hotter plug than NGK-R5671A-10) Spark plug gap for Points is .035 and any electronic or MSD is .040-.045

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