Help with 460 EFI HP and MPG?

I have 1994 F250 with a 460 fuel injected engine. now when it comes to trucks I know my fair share but not enough. I'm saving up for a rebuild on it and I want to put some power adders on that won't completely kill my MPGs. But I'm not sure what to do. I know I'm going to put a camshaft in, but what else should I on a milder budget? also I'm going to headers and I was going to run them alone with no exhaust, but a friend of mine said I needed and exhaust for back-pressure or else I will be negatively effecting the engine and losing HP and MPGs. True?


any help is much appreciated. thanks

Help with 460 EFI HP and MPG?
Comp %26amp; Crane are two of several reputable cam companies that offer replacement camshafts w/ both improved performance %26amp; fuel economy over stock choices. This is going to be your best dollar/ results area, %26amp; will work well w/ stock exhaust/ intake systems. Performance %26amp; economy DO have something in common %26amp; that is efficiancy. Both aim to get the most from each drop of fuel. Educated cam selection should allow you to make reasonable gains in both areas. And please keep a full exhaust system!
Reply:If you want power and economy think smallstock camshaft with direct drive gears and degree the cam in as per specifications that come with the cam.If you put headers on use the smallest pipe possible,do go any bigger than 2.5 to 3.0 exhaust use quality mufflers Flow Masters are good it will give you the neccessary back pressure you need at least 1to 2lbs otherwise the fuel will just go through the intake right out through the exhaust
Reply:i own a repair shop,and the words fuel economy and performance don't go together when you say the numbers 460,it just don't happen,i have built too many of them,the best you might get from it will be around 8-10 miles to the gallon if your lucky ,and yes if you try to open this one up you,ll kill the engine,it wont run without some kind of back pressure on it basically none of them will they all have to have some,but a 460 will not get any mileage at all once you modify it,but it can be made to run really good,just add another tank to it,and you,ll think its getting gas mileage,when you say the words performance and mileage they don't go together good ,especially on a 460,good luck with it hope this helps.
Reply:The best thing I did with my 460 was to port the exhaust side of the head. The exhaust gases go through an area the size of a quarter. There are emission humps there just grind them away you should be able to stick three fingers in the exhaust ports after your done. Use a set of headers and high flow exhaust system, are it will not be worth the time. Did not affect my truck one bit. Did gain about 50 HP but not MPG.

dds