Ford HD exhaust
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
I did all of the grinding while everything was out of the engine. I just laid the three manifolds on the ground and lined them up. If something was binding, I took the manifold in question over to the bench grinder. Once all three went together flawlessly, I put them on the engine.
That being said, the carb motors are SO much easier to work on and there's tons more room. It took my friend and I about 4 - 5 hours to remove the exhaust manifolds from his donor truck after wading through all of the fuel injection stuff, removing all the tiny pieces here and there, accessing all the bolts that were hidden and difficult to reach. Then, it took me 15 - 20 minutes on my own to remove the intake/exhaust from my carb engine so I could get to work.
Never had to lift the motor for either procedure though.
Plenty of room to work:
That being said, the carb motors are SO much easier to work on and there's tons more room. It took my friend and I about 4 - 5 hours to remove the exhaust manifolds from his donor truck after wading through all of the fuel injection stuff, removing all the tiny pieces here and there, accessing all the bolts that were hidden and difficult to reach. Then, it took me 15 - 20 minutes on my own to remove the intake/exhaust from my carb engine so I could get to work.
Never had to lift the motor for either procedure though.Plenty of room to work:
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
However, you can see on cylinder number 4, the bump on the exhaust manifold elbow's been removed. That'd the only one I had trouble with.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
Thanks guys for the info. And thanks AB for the picture! I see you have your first manifold running directly into the second at a "Y". Did you do that or did an exhaust shop? What size pipe are you using? I would have thought by running the manifolds into each other so soon it would choke off a lot of the scavenging affect (I don't know what I'm talking about, I'm just saying what I think would happen). How much of a power gain did you notice from adding the EFI manifolds?
Also, do you guys have a lot of carbon residue on your tailpipes? How much is normal? I'm off to google "carbon" to see why it's there to begin with.
Thanks again!
Also, do you guys have a lot of carbon residue on your tailpipes? How much is normal? I'm off to google "carbon" to see why it's there to begin with.
Thanks again!
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
I did all of the work myself and ran 2.5" from the engine to the tailpipe. Fortunately, there's an aftermarket 2.5" performance pipe made just for the EFI 300 that I could use. Part number: Walker 45166. It mated up ever so perfectly.
As for performance loss, I know the stock has two outs that go into a cat, and then the cat has a single out, whereas this goes into a collector, and then into a cat. So they both kinda do the same thing, although this one's bigger. Secondly, no matter how you look at it, it's a far cry less restrictive than the stock carb exhaust! lol
Performance difference was absolutely amazing from the first time I stepped on the gas. Going from a six into one manifold, 1 7/8" exhaust pipe, to dual manifolds with 2.5" exhaust... It undoubtedly unleashed about 20+ hp without exaggeration.
I do have carbon residue on my tailpipe and am trying to figure out why. Everyone says it's a sign of running rich, even though all my testing says that with my current jetting, I'm running lean.
As for performance loss, I know the stock has two outs that go into a cat, and then the cat has a single out, whereas this goes into a collector, and then into a cat. So they both kinda do the same thing, although this one's bigger. Secondly, no matter how you look at it, it's a far cry less restrictive than the stock carb exhaust! lol
Performance difference was absolutely amazing from the first time I stepped on the gas. Going from a six into one manifold, 1 7/8" exhaust pipe, to dual manifolds with 2.5" exhaust... It undoubtedly unleashed about 20+ hp without exaggeration.
I do have carbon residue on my tailpipe and am trying to figure out why. Everyone says it's a sign of running rich, even though all my testing says that with my current jetting, I'm running lean.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
I did all of the work myself and ran 2.5" from the engine to the tailpipe. Fortunately, there's an aftermarket 2.5" performance pipe made just for the EFI 300 that I could use. Part number: Walker 45166. It mated up ever so perfectly.
As for performance loss, I know the stock has two outs that go into a cat, and then the cat has a single out, whereas this goes into a collector, and then into a cat. So they both kinda do the same thing, although this one's bigger. Secondly, no matter how you look at it, it's a far cry less restrictive than the stock carb exhaust! lol
Performance difference was absolutely amazing from the first time I stepped on the gas. Going from a six into one manifold, 1 7/8" exhaust pipe, to dual manifolds with 2.5" exhaust... It undoubtedly unleashed about 20+ hp without exaggeration.
I do have carbon residue on my tailpipe and am trying to figure out why. Everyone says it's a sign of running rich, even though all my testing says that with my current jetting, I'm running lean.
As for performance loss, I know the stock has two outs that go into a cat, and then the cat has a single out, whereas this goes into a collector, and then into a cat. So they both kinda do the same thing, although this one's bigger. Secondly, no matter how you look at it, it's a far cry less restrictive than the stock carb exhaust! lol
Performance difference was absolutely amazing from the first time I stepped on the gas. Going from a six into one manifold, 1 7/8" exhaust pipe, to dual manifolds with 2.5" exhaust... It undoubtedly unleashed about 20+ hp without exaggeration.
I do have carbon residue on my tailpipe and am trying to figure out why. Everyone says it's a sign of running rich, even though all my testing says that with my current jetting, I'm running lean.
Anyway, you know how I had 3.50'' echo tips? I had enough carbon to make both of those tips completely black on the inside. I finally quit trying to keep them clean. I think my truck was running rich because by the time I got to work, my motor had JUST warmed up. Thus the 8 mpg in town. I'm kind of curious now though because after 1,100 miles of highway driving you would think my motor would havecleaned out a lot of carbon.
Anyway I'm off to google (got sidetracked before)
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
My biggest issue is lack of a video camera. I sneak one out of work from time to time, but that's about it. As for pics:
1981 Ford Bronco Random Pictures pictures, videos, and sounds | SuperMotors.net
Just a couple random ones throughout the years. I need to put some more on there.
1981 Ford Bronco Random Pictures pictures, videos, and sounds | SuperMotors.net
Just a couple random ones throughout the years. I need to put some more on there.
Thread Starter
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Elder User
Joined: Sep 2008
Posts: 563
Likes: 0
From: DeKalb, Ill.
I'm a weirdo. I want any mods I do to my truck to be "period correct" and Ford parts.
I'm pretty sure this HD manifold was discontinued before my truck (I think '73).
I'm willing to bend that far.
What abandonedbronco had to say about grinding the intake;
I am prepared to do that, just not if I have to weld cracks in the exhaust too.
Bottom line, I'll get to the exhaust sooner or later.
Right now, my plate is full.
I have a noisy release bearing and a valve train that could use an adjustment.
Keep these posts coming though.
This is good stuff!
Murph.
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Elder User
Joined: Sep 2008
Posts: 563
Likes: 0
From: DeKalb, Ill.
I want to share my truck's sound with everyone because it
sounds unique compared to all of the sound clips already posted.
It's the junky sound of a stock '75... and I LOVE it.
I'll get a clip up sooner or later.
Murph.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
I'm really curious to see if your truck sounds like what I think it does. How do you have your exhaust system set up anyway?
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
My pipe doesn't blacken at all...sort of a reddish-rusty color even with cold starts and short trips around town. Until it's warmed up quite well, it pukes a lot of vapor just like late model vehicles.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
Murph.. *Bill does the Jedi hand wave thing* You shall straight pipe your truck..
Thread Starter
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Elder User
Joined: Sep 2008
Posts: 563
Likes: 0
From: DeKalb, Ill.
No chance.