Ok here is the deal. I have a 92 F-350 with 460 and automatic. I am going to build a motor to put in it and I dont know wheather I should back EFI cause I like the reliablity or it and easy starting etc. Or should I try to go carb. How much trouble would it be to go with a carb set up? And if I keep my EFI set up what all would I have to do to make sure I am getting enough fuel to my motor?

 

If you're building a stock-ish motor, maybe with headers, a little port work, slightly bigger valves, and a truck/RV cam, the stock 92 EFI system will serve you well. The key is to not go insane with the cam. See the 92-95 Truck EFI system is "speed density" which makes it's fuel and timing adjustments based on engine vaccum. A lumpy cam will make the vaccum eratic, and the EFI system will get very confused.

If you wish to do something a little more exciting with your engine, you might consider using a mass air setup, which instead of measuring engine vaccum it measure the airflow going into the engine itself, just after the air filter box. Cars got that system in the late 80's, and trucks didn't follow suit until around 96ish for the most part (some earlier in CA, CT, MA, VT and a few other states).

But of course converting to a different EFI requires some effort, and some parts collection. Probably the most common method is to find the wiring harness, EFI computer, and sensors off a 89-93 5.0L Mustang, mostly because that particular EFI computer is so well hacked that with a programmer (like tweecer, eec editor, and so forth) you can use your PC (or laptop) to make changes in the EFI system so that the computer can properly run your 460 regardless what you've done to it. REmember that 89-93 mustangs had a 5.0L, just a hair smaller than your 7.5L ;-)

If you want to go nuts with the cam and such, and the above paragraphs make you weary, a carb is a good way to go. While I'm not carb-compatible many people have no problem tuning them for power and reliability. Me, they always explode.

 

Well, I would like to put a pretty wild cam in it, also I am considering stroking the motor. I want to keep my EFI system, and I want to do so in the easiest way possible. What you said about the Mustang system and everything kinda confused the heck out of me :S. What I plan on doing is stroking the motor and putting some better breatheing heads on it aloong with Headers, to help the motor brethe better to help on gas mileage. The truck is a 92 F-350 regular cab long bed 4x4 6 inch lift and 38.5 inch tires. I dont plan on pulling anything with the truck and I dont plan on doing any mudding with it I just like the look of a lifted truck. So what would you recommend??

 

The stock EFI that you have can adjust itself for slightly larger motors, as well as slightly more cam.

If you go out of say, 5% over stock in bore/stroke/cam overlap, then your stock EFI system isn't going to be happy and in turn, you're not going to be happy.

The mustang EFI system from 89-93 is a common choice for people who want to upgrade their engines. See, once you build and engine significantly away from stock, you need to "adjust" the parameters in the computer of the EFI system in order to make it run correctly.

I suggested the mustang system for a variety of reasons - but the major reason being that there are tools already existing to made such modifications. Obviously you'd need a 5.0L Mustang EFI system from a donor car, ebay, car-parts.com or some other source, and you'd need tuning software and a PC or a laptop. Tweecer.com offers one of many choices that will allow you to retune the mustang system for your new engine.

There are also aftermarket EFI systems such as Accel DFI, Electromotive Tec II and Tec III, Motec, and a variety of other not-so-inexpensive solutions, but they come "complete" whereas everything you need to make it work, including software for your PC or laptop, is there. What you're doing is trading research time and parts collection time, for cash.

 

If you swap out the heads for non EFI heads then the EFI intake will not fit and neither will your exhaust manifolds.

 

Ok that is what I was wondering thank you so much RTM. Ok now that I have this information. How much trouble would it be to go to carb?

 

It's not to much trouble if you can locate the heads, intake and exhaust manifolds or headers then it's just a matter of swapping the heads which would be the most labor intense part of the job.

If you were closer I would help with the swap and swap you parts for your EFI stuff but again the drive is to far for me.

 

Well I am thinking about justbuilding a motor on the stand and swapping them out. There is nothing wrong with the motor I have now I just want some more power it is a 92 with only 88,000 miles on it. Would you be interested in the motor?

 

Wha tranny do you have behind it?

 

It has a C6 behind it

 

I have four 460 motors already but no EFI motors. I have a lead on all the EFI stuff I need for my swap if I do go that route. thanks