Header / EFI manifold questions

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Mar 26, 2005 | 09:55 AM

phatpony

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Joined: Jan 2005

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From: New Bern, NC

Header / EFI manifold questions

OK, so I thought I would go ahead and replace my exhaust / intake gasket in my 81 F-100. All was going well until I needed to replace the flange studs on the exhaust manifold, when "SNAP" one breaks off, leaving the rest of it hopelessly stuck in the manifold. Now, I could go get the tools necessary to remove it, but it will be the same ol fight trying to break the rusted seal on it, and I just dont want the frustration.

I have talked the spousal unit into letting me upgrade that portion of my truck. I want a header, but what about the EGR stuff? Does that get eliminated (visual checks for emmisions), or is there a bung welded onto the header for the EGR tube? I could go the EFI manifold route, but then I would still have to get the Walker down pipe, and when all is said and done, I would be almost to the point if having spent enough for the header anyway.

When it comes to headers, what is your reccomendation? I have seen the Pacesetter, Hedman and I think Hooker. Any one better than the other?

Thanks in advance for any advice.

Mar 26, 2005 | 10:49 AM

chris1937

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Joined: Nov 2004

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From: Greenville SC

Headers

Do you have a I6? If so I would go with Clifford. They have a very informative web site. They specialize in that field. Recommend the x-pipe. A small price for the xtra HP.

Mar 26, 2005 | 04:55 PM

phatpony

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From: New Bern, NC

Well, I did a little more research on my own, and I think I will just go the EFI manifold route. That brings up a few more questions though. Can I still use the stock non EFI intake manifold with EFI exhaust manifolds? I think so, but just wanna make sure. Any drivability issues? I know that going with these manifolds, there will be no more heating of the intake, not directly anyway. What about that danged EGR tube, can mine be bent to fit the EFI manifolds, and if so how? It sure seems like a stout piece of pipe, more inclined to kink than to bend. What about the extra holes in the EFI manifolds, do I just ignore them? I mean, I have no holes in the head to put any bolts, so I assume just leave them out. Any other things I should know about? Use EFI gaskets maybe?

Last edited by phatpony; Mar 26, 2005 at 04:58 PM.

Mar 26, 2005 | 06:18 PM

mattri

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I just put the EFI manifolds on my 80 Bronco. There are extra holes on the EFI manifolds. What this means is that there are more holes in the EFI heads than in the old carbed heads. Yes you can just ignore them. As far as EGR goes there is a threaded connector on the rear EFI manifold for an EGR pipe. If you can make this work great, I just plugged the one on mine. Yes they will work with a non EFI intake but you may want to grind some of the tabs on the EFI manifolds down to make them fit easier. I did this on mine. Notice I did not say make them fit better, just easier. This is because grinding the tabs for the bolts/studs you do not use makes it easier to slide the EFI's on after the intake is already in place. Note however that I was using a Offy intake so if you're using the stock intake this may not be an isue for you.

Mar 29, 2005 | 01:28 PM

sail2244

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Joined: Jul 2003

Posts: 208

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From: Meggett SC

I hooked up the EFI Manifold on my 84. The intake manifold will work fine but i had to file a few spots on the exhaust manifold that interfered.
The EGR here is what i did,
took all fittings out of the spacer under the carb. and out of the exhaust Manifold. These holes are theaded for 3/4" pipe threads. in the exhaust i put a short 3/4" pipe nipple, 90 degree elbow facing outboard another short nipple, 3/4" pipe tee bull of the tee facing the front of engine, and then a 90 degree street elbow. I bought some copper tubing 3/4" and two 3/4" pipe to tube fittings.
This worked out real good as it only took a short straight bend to connect the egr intake spacer to the bull of the tee. I packed the copper tube with wet sand (tightly) and bent the pipe into the tightest bend i could. The sand keeps the pipe from buckeling.
In the street elbow i plumbed the check valve for the air line from the thermactor air valve.
Worked great.
Good Luck

Mar 29, 2005 | 06:55 PM

phatpony

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From: New Bern, NC

Thanks, I'll keep that in mind.

Mar 30, 2005 | 11:35 AM

superbepro

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Joined: Jun 2004

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Show pic of EGR mod on EFI exhaust

sail2244:

Could please show us pics of the EGR modification (set up) done to the EFI exhaust manifolds in your truck. like they say "a picture is worth a 1000 words"

Thanks

Raul