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Depends on what type of ignition system you have. If you have a vehicle made before 1975 with points, about .030- .035 is an acceptable gap. If you have an electronic "hei" ignition you can run larger gaps .045-.060 is common. On a street driven car there is little to be gained in power or mileage by fooling with plug gaps, unless the vehicle has ultra high compression, is turbo or supercharged, is running extremely lean, or has a weak ignition. Most spark plugs will be gapped correctly right out of the box.

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16y ago

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