I need help on my 1984 f-250 cab & half with a 460 v8 with a 4 speed and 4 wheel drive, and I think it has 4:11 gears in it. I have the manifold off right now and I was wondering if it would cut my gas milage if I took off the emissions(EGR) or if it would help. I am getting about 10mpg if I keep my foot out of it and about 6mpg if I keep it hammered all the time(this is all befour I put in new plugs, wires, cap, rotor. I have not yet got gas milage with the new components.)I have just rebuilt the stock Holley carb. I also kind of wanted to put a new manifold and maybe a carb on since I have the old ones off also. Is there a good combination to give me more response and better gas milage? I use the truck to just drive back and forth to school and go to our cottage with it. so I do some around town and also highway driving. And lastley what is the horsepower rateings and torque rattings for this? Thankyou, Steve If you live in the michigan area and have any old outboard motors(pre 1960) e-mail me Thanks.

 

Most 460s seem to get around 10 to 11 MPG is you drive 'em nice and easy. The late model EFI ones maybe a mile or two per gallon better. No matter what you do (and I have to emphasize that!), you won't get any better mileage than 10 or a little better. A carb or manifold change won't change your basic mileage.

4.10 gears are pretty much for towing and hauling heavy loads, definitely not gas saving economy gearing.

If you don't tow often, and you want to use the truck as a daily driver, the single thing you can do to increase mileage is to change to taller gears, 3.5x or something like that. That might get you 2 something MPG, depending on how much stop-and-go driving you do. A good low restriction exhaust or headers might get you 1/2 to 1 MPG improvement. That's what I got. Or maybe not, depending on how you drive.

I own a'96 F-250 with an auto and 4.10 gearing, I occasionally drive to work in it, but my main use is towing trailers and farm work. That it does very well. A 460 powered pickup is definitely not an ideal commuting vehicle, if gas mileage is an issue.

From what I know, the EGR doesn't help or hurt your mileage either way. I'd leave it hooked up. People disconnecting the EGR have sometimes reported pinging and other problems requiring timing and carb jetting changes to correct.

The factory HP rating on your engine is around 250, IIRC.