EGR Use
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Senior User
Joined: Aug 2006
Posts: 129
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From: Salem, OR
EGR Use
Somewhere in my truck's past, a 600 cfm Edelbrock carb was installed in place of the stock Motorcraft unit on the original intake manifold (at least it appears to be). After doing some poking around on it last weekend, I noticed that the EGR Valve is missing. I found some diagrams and pictures of the stock intake manifold and the edelbrock carb, and came to the conclusion that they couldn't have put the EGR system back on when they replaced the carb. On top of that, the edelbrock intake manifold that I'm planning on switching to when I rebuild my motor doesn't have EGR either. I've heard that not using EGR on a motor that originally was equipped with it can throw some things off, specifically in the timing department. Is this correct? Will I need to recurve the dizzy, or buy a new aftermarket setup?
Senior User
Joined: Mar 2007
Posts: 458
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I just swapped out my stock carb/intake with EGR last weekend. I put on a Weiand 8010 intake and the Edelbrock 1406 4 barrel carb, without EGR. I asked the same question you are asking and I received both answers. Couple guys on here said that I'd have to recurve the dist. My brother in law has been working on these old trucks for 20+ years and he told me not to worry about it, just swap it out and forget it was ever there. Unless you're trying to get every ounce of performance out out of it but you'll probably never notice it. So thats what I did its gone and my truck runs 100 times better than it did before and I'm happy with it. So I guess its a matter of opinion but I just left it out and I dont have any problems at all.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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The OEM distributor will ping unless the base timing is reduced. Unfortunately this reduces mileage and performance. Some people don't care if mileage is reduced 2-3MPG. The distributor vacuum advance unit will need to be adjusted for the lack of EGR to restore the base timing, mileage, and performance. I have been working on Fords and these old trucks for 40 years...
The introduction of exhaust gas into the intake at part throttle cruise required advancing the timing to burn the less combustible mixture. Without EGR the advanced timing will cause detonation or pinging.
The introduction of exhaust gas into the intake at part throttle cruise required advancing the timing to burn the less combustible mixture. Without EGR the advanced timing will cause detonation or pinging.
Posting Guru
Joined: Oct 2005
Posts: 2,282
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From: Oregon
http://www.edelbrock.com/automotive_..._sb_perf.shtml
Scroll down, Edelbrock does offer an EGR spacer with the manifold...
Scroll down, Edelbrock does offer an EGR spacer with the manifold...
