1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Spark Plug Gap

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May 5, 2019 | 07:37 PM

#1

Christopher Workman

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Joined: Jan 2018

Posts: 33

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From: Craigsville

Spark Plug Gap

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

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Old

May 5, 2019 | 10:31 PM

#2

vjsimone

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Joined: Jun 2013

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From: Somewhere n North America

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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May 6, 2019 | 09:58 AM

#3

Wagonboy

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Joined: Jul 2007

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From: Middle Tennessee

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

Mine says Gap .042 - .046

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Old

May 6, 2019 | 10:24 AM

#4

1986F150six

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Joined: Jul 2009

Posts: 6,477

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From: Sheffield, AL

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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