Side gapping spark plugs has been use in racing for years to increase horsepower by unshrouding the spark thus allowing the flame created to propagate faster resulting in a more complete burning of the fuel/air mix.

Many manufacturers offer plugs deemed racing plugs that are side gapped but at inflated costs.

By doing it yourself you can use a cheap plug to save money and increase horsepower.

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In this video, you'll see how side-gapping is done.

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