One of the most often neglected easy and inexpensive maintenance items I see on gas engines. Why do people think that spark plugs will last forever or that it doesn't matter what type of plug is used! Aren' they all created equal? The procedures shown in this video apply to all M116 3.5, 3.8, and 4.2 liter V8 engines from 1969 to 1991 350, 380, and 420 models. All M117 4.5, 5.0, and 5.6 liter V8 engines from 1971 to 1991 450, 500, and 560 models.
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