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• Stock Street Engine 0.045"-0.060" (1.1mm-1.5mm)

• High Performance Street 0.030"-0.035" (.75mm-.9mm)

• Alcohol High Compression 0.025" (0.65mm)

• High Power 75 -115 HP per Cylinder 0.025" (0.65mm)

• Over 115 HP per Cylinder 0.022" (0.55mm)

• Over 12:1 CR or Over 14psi Boost 0.022" (0.55mm)

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Q: What is the Spark plug gap for a 1999 ford F150 5.4L V8?
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