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Exhaust manifold

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Angelking
Registered User
Posts: 104
Joined: Wed Dec 21, 2016 8:46 am

Exhaust manifold

Post #1 by Angelking » Thu Oct 05, 2017 11:49 am

Am planning to use the dual exhaust manifolds from the EFi engine...... Don't ask why, have my reasons. Have found several of these these on ebay that claim they fit 1987 and up. My block is an '81, I assume, maybe wrongly, the head is original.. Am just curious if these manifolds would work on my head? Sorry for the rambling post.


SM

1986F150six
Registered User
Posts: 307
Joined: Wed Oct 24, 2012 3:11 pm
Location: Northwest Alabama

Re: Exhaust manifold

Post #2 by 1986F150six » Thu Oct 05, 2017 12:07 pm

They will work. 1987 was the first year for fuel injection. Sometimes a little metal needs to be ground off due to slight interference with the alternator mounting bracket.

Angelking
Registered User
Posts: 104
Joined: Wed Dec 21, 2016 8:46 am

Re: Exhaust manifold

Post #3 by Angelking » Thu Oct 05, 2017 12:08 pm

Thank you very much.....


SM

79broncojoe
New Member
Posts: 2
Joined: Tue Oct 10, 2017 6:57 pm

Re: Exhaust manifold

Post #4 by 79broncojoe » Tue Oct 10, 2017 10:10 pm

Hello, I am not sure of the year of my 300-6, thinking 84, when I look into buying split exhaust manifolds it appears 87-96 (trucks\van) have different part numbers from different years, just to be clear does any year from 87-97 whether truck or van works?

Thanks
79broncojoe
Cheers!
79broncojoe

Big64my79Effie
Registered User
Posts: 18
Joined: Mon Aug 17, 2015 11:30 am
Location: Alvaton, KY

Re: Exhaust manifold

Post #5 by Big64my79Effie » Wed Oct 11, 2017 9:54 am

My '79 pickup has a '85 300 in it. The head is still '79. I used new '95 exhaust manifolds. I'm doing the same set up you're considering. The difference is the inclusion/placement of threaded holes for oxygen sensors. I had to "trim" a little off the front manifold to clear the Offy intake. There has been some cracking Issues I have heard of with manifolds with the bungs (after I already bought). I guess I'm taking my chances there. The early manifolds don't have the bungs and don't crack. I think '87 to '89 but I'm not sure. Someone will chime in if I'm wrong. If mine crack, I'll go to a pickapart/wrecking yard to get them. Right now they are plentiful and cheap.

User avatar
Dr Jay
Registered User
Posts: 202
Joined: Sat Oct 05, 2013 6:12 pm
Location: North Alabama

Re: Exhaust manifold

Post #6 by Dr Jay » Wed Oct 11, 2017 3:47 pm

My advice here is to use the manifold clips discussed by Frenchtown Flyer and others. Easy to research using the search function.
My split manifolds age great. Without clips they migrated then leaked regardless of gaskets etc...
Clips are only needed when used on non fuel injected heads!
Blessings,
Dr Jay

1978 F100 Shortie, Lowered front and rear, 300 .030 over, 300 carb head, Clifford, Holley 390
268 Comp Cam, Cloyes, Fuel Inj. exhaust manifolds, MSD 6A, TOD, 9"

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