My Truck came stock with a 400 with EGR, and i am in the process of putting a Edelbrock Performer 4 bbl intake and carb on it. My question is, do I have to put EGR back on?

Thanks
JM

 

Sorry, but first I don't believe any of these trucks came stock with a 400... Not this year range anyway. However, I am not an expert in these trucks. EGR from my understanding (reading here) will learn out your mixture at cruise, which helps to reduce the gas flow needed, resulting in better mpgs. That being said, I believe its possible to remove them and then mess around with your timing to just until it starts to ping and back it down.

 

According to the VIN number, and the little sticker on right above the rill under the hood says it came with a 400. My build sheet should be here soon so i will know for sure then.

Thats what i thought, i just wanted to be sure. Ant thoughts from anyone else?

 

It very well could of as I said I'm not an expert by any means, just that I haven't seen one in my tenure here. Perhaps you can search for "egr delete" to see what you are in for?

 

Thats a good idea. ill give it a try

 

I just went ahead and did a search myself. I determined that said device is an emissions device not a fuel device. That being said, I asked this very question when I first joined up here and I was told that it will decrease mpgs should I remove it....

 

so it would be in my best intrest to put it back on there...

 

Yeah honestly all that stuff is there for a reason and in all likelyhood it will run at less than optimal without it.

 

You'll need the correct manifold to reinstall the EGR; mine is the Performer 400 EGR
which hs the necessary plumbing from the heads up tot he carb for the EGR:



Notice the small oval-sized hole above the two larger ones. I have no idea what the 2V
EGR spacer plate is there for.

The M-block engines (351M, 400) began life in the early 1970s in large sedans, their
Bronco lives in the mid-70s, in these trucks in, um, must have been 1980, I think the 70s
trucks were still using the 360s & 390s FE-series engines. The M blocks were phased
out in 1982.

M-Block 351M/400 History

If it came with a 400 from the factory, the VIN code (7th or 8th place, i forget) is a Z.

The rest of the engine is designed to be used with the EGR and its related devices &
plumbing all in place; without it, you will likely need to play with your ignition timing
and/or distributor's timing advance curve to keep it from pinging under load.

 

If you are putting a intake on it with no EGR provisions, and are also putting a non-stock, non-emissions aftermarket carb on it, you can eliminate the EGR system.

 

351M and 400 engines were an option between 1977 and 1982.

There is also a rare 255 V8 that was offered for two years that was quite frankly awful.

The EGR is a emissions device. It can have MPG saving side effects though. That and a stock engine is calibrated to use it.

I agree with Franklin, using a aftermarket carb and intake would negate the need. although retiming and adjusting the timing curve may be needed.

 

Run a setup without the EGR, just be sure to get the correct non-EGR intake. You should have performance and MPG improvements over the factory smog setup.

 

Thats the one i have been looking at, i just found a good deal on one that is a non EGR and was wondering if it would work. Do you like the EGR on there?

 

Would i still be able to pass emmisions?

 

I don't have an EGR on mine but I don't need to worry about passing Emissions tests
for a while. There is no way it'd legitimately pass that test without one.

But I *did* buy the 4V EGR plate (Edelbrock #8053) to install and at least make it appear
that one is installed in the event I need to pass an Emissions test again.

I should also mention that I totally rebuilt my engine.

You could get the non-EGR Performer 400 and that EGR plate to install beneath your
carb, hook everything up so that it appears to be installed and functional.

But I'll bet you'll still need to pass the sniffer test....