First off, this site is awesome and I have become an addict! What a wealth of information.

I have a 1985 F250 4x4 with a holley 4180 carb and stock manifold(EGR). I am planning on replacing both when it warms up a bit (it's been -26 F the last couple of days) with and Edelbrock performer intake and 750 cfm electric choke carb. My question pertains more to the intake as I would like to use a non EGR intake and am not sure if I can. All smog equipment is removed from the truck. Can I replace the stock EGR manifold with a non EGR from Edelbrock and what does this entail? Can I eliminate the EGR valve and other such equipment with a minimum of headache?

Any and all info would be helpful as I have never tackled this before.

 

The suspense is killing me!

 

You didn't mention what kinda of motor you have, but I assume you have a 460 since you have a 750cfm carb.

I did that in the F-250 with 351W without any problems. However, I wish I now would have used an EGR manifold since emission are starting to get tougher where I live.

 

Sorry,

Yor are correct in assuming I have a 460. We don't have any emmissions testing in Montana so that is not a big concern for me. Are there performance increases by using a non-EGR manifold?

 

There is nothing special you need to do to install the non-EGR manifold on your motor. Calibrating the carb will be the most important. You will get the best mileage from a properly tuned carb. Many people think that leaner is better when it comes to fuel economy. That is only true to a degree. Too lean and you will have many other problems. Tune it so that you are on the slightly lean side of the correct air/fuel mixture range will give you the best economy. Also, making sure you have fresh plugs, clean air filter, good spark plug wires, and fresh rotor and cap will help a lot. Maximizing the ignition timing without causing any pre-ignition is very beneficial.

The one best thing to do is keep you foot out it. That will make the single biggest difference.

Having said all that there is really not much, if any benefit, in replacing the intake manifold. It is one of the lowest returns on money and effort you can do to your motor. The carb will help, MSD ignition will help, and headers will help, but the Edelbrcok manifold – or any other for that matter- is not really any better than the stock unit for the way most people use their trucks. If you are planning on turning some high rpm’s and such then there are better manifolds, but not for street use.

Good luck,

Mark

 

Thanks for the help Mark!