Spark Plug Gap

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05-05-2019, 07:37 PM

Christopher Workman

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Spark Plug Gap

What should the spark plug gap measurement be on a 4.9l Straight 6 engine?

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05-05-2019, 10:31 PM

vjsimone

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Quote:

Originally Posted by Christopher Workman

What should the spark plug gap measurement be on a 4.9l Straight 6 engine?

1986; Copper Resistor Spark Plug; GAP - 0.044

What altitude are you operating in ?

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05-06-2019, 09:58 AM

Wagonboy

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Should be on this label under the hood. On the front radiator support.

Mine says Gap .042 - .046

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05-06-2019, 10:24 AM

1986F150six

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Quote:

Originally Posted by Wagonboy

Should be on this label under the hood. On the front radiator support.

Mine says Gap .042 - .046

I believe Mr. vjsimone pretty much nailed this one: "1986; Copper Resistor Spark Plug; GAP - 0.044"

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