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Old Mar 8, 2014 | 08:59 PM
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Donut Gasket Help!?

85 F150 w/300: Is there supposed to be a donut gasket on the exhaust (size/part #)? Tks.
 
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Old Mar 9, 2014 | 11:20 AM
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My '81 required one. I don't believe the exhaust manifold changed until '87 when they went to EFI, so I would think yours would be the same.

However, looking on RockAuto, O'Reilly, and SummitRacing, they only list them for up to an '84, so maybe they changed it? Are you thinking you need one?
 
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Old Mar 9, 2014 | 02:52 PM
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Yes, I went to Autozone this morning and the guy told me more or less the same thing...he had no listing for an 85. He ended-up selling me one for an for a 62-84 6-300 (less then $2). There seems to be a small exhaust leak where the gasket does/should go.
 
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Old Mar 9, 2014 | 03:02 PM
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Yeah, they're super cheap, and quick to change out. Just two bucks and two bolts.
 
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Old Mar 9, 2014 | 03:34 PM
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I was just curious if anyone knew for sure if I needed one...not sure if I can put one in if Ford didn't...I guess I'll know later today LOL
 
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Old Mar 10, 2014 | 10:27 AM
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1984-1986 had no donut gasket. The exhaust manifold has a ball shaped outlet and the headpipe is flared.
 
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Old Mar 10, 2014 | 11:05 AM
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That's what I was afraid of. Any thoughts on how to repair mine...it doesn't seal all the way and has a small leak?!
 
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Old Mar 10, 2014 | 12:36 PM
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Sean,

I would guess the best would be to ask a muffler shop. They must have a tool to flare the end.

On the other hand, Walker brand makes replacement exhaust pipes and mufflers for our trucks and they are available at most automotive parts houses. The only problem I can see with this is that most likely, the replacement headpipe will come with a catalytic convertor, which you may not need.

http://shop.advanceautoparts.com/p/w...932%7CL2*14983

Using the link, you can see the headpipe.
 

Last edited by 1986F150six; Mar 10, 2014 at 12:39 PM. Reason: Added link
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Old Mar 10, 2014 | 01:12 PM
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Good call. I'll see if I can just get a replacement headpipe.
 
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