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11-21-17, 11:44 AM
Understanding spark plug heat range, plug gaps, and more tips for performance Ford applications
Click to Read Full Story... (http://www.mustangandfords.com/how-to/engine/1711-spark-plug-tuning-tips/)
Click to Read Full Story... (http://www.mustangandfords.com/how-to/engine/1711-spark-plug-tuning-tips/)