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Old 04-26-2020, 07:02 PM   #1
Aarongriffey
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Default Firing order 91 F150?

So I’ve just done a major rebuild on a 302 out of an F 150 that’s going into a ‘65 Mustang.
I know number one is right front but I also know there was a firing order change sometime around there. I used a new 91 Mustang cam.
Can someone clue me in?
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Old 04-26-2020, 07:46 PM   #2
darrell
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Default Re: Firing order 91 F150?

the old was 15426378.the new 13726548
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Old 04-27-2020, 12:29 AM   #3
Aarongriffey
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Default Re: Firing order 91 F150?

Do I have an old or a new?. The motor is a 1991.
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Old 04-27-2020, 06:26 AM   #4
ponymare
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Default Re: Firing order 91 F150?

Unless its listed as an HO, its I 5 4 2 6 3 7 8, it should have told with the cam which order to use, if you still have your old cam, you can compare lobes.
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Old 04-27-2020, 08:51 AM   #5
darrell
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Default Re: Firing order 91 F150?

most of the trucks had 13726548.if that doesnt work change it.
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Old 04-27-2020, 09:08 AM   #6
rotorwrench
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Default Re: Firing order 91 F150?

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The cam is the key to the different firing orders. If it has a 351 or HO type cam then it will have that firing order. A person can check it by getting #1 on compression then rotate till the next cylinder (either #3 or #5) comes up on compression. That will tell you what the firing order is for that cam.
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Old 04-27-2020, 03:24 PM   #7
Aarongriffey
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Default Re: Firing order 91 F150?

Thanks guys, I can easily figure that out. I’ll do like Rotowrench suggested.
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