i gotta slide a quik question in here...i intend a similar build with my currently locked up 460, and as i always do i plan on ridding myself of the useless emisions crap..no test here...however this engine has a egr valve sensor...i had a bad one on a tempo i had and i caused a 4cyl to get about 9mpg and my exhaust was 90% unburt fuel cuz it confused the computer so bad...sooo what is gonna happen it i toss my egr and emmisons? the same thing? if so what all can i safely trash?

 

I left the egr alone i removed the cat and the air pump. I have read removing the egr will hurt fuel economy just like you stated so i would leave it alone
Richard

 

ok that is probably what i will do, i had assumed that the egr would not function properly and cause the same problems if you remove the cat...but if you removed yours i guess it is fine...have you had any probs with your setup?

 

for those with a cam u can run with SD still on how much gain did u feel in the sotp dyno compared to stock

 

WTF! Needed a teenage translater for this one.

We speak english here. Use full sentences please.

 

i think he meant....oh hell i'm only 26 but i have NO CLUE!

 

sorry i was runnin away while i was writin 1st day one the forums in a while (school and bike) but i was tryin to ask how the seat of the pants dyno felt when you swapped cams using one thats mild enough to use with stock speed density set up. not to thread jack but im thinkin bout putting heads and a cam with the stock speed density and headers and single 3" exhaust

 

I noticed a big improvement but the cam was installed along with the head work and the Thorley headers so its hard to tell how much was just the cam.
I had the fuel injection kit and the 3" cat back exhaust with the cat gutted already installed so its hard to tell. I have had zero problems with the speed density truck runs real good and I,m getting 14 to 15 mpg on the highway unloaded and behaving myself of course.
Richard

 

what kind of head work are you gettin done im thinkin bout picking up aftermarket heads at the same time as the cam did you do the work yourself?

 

i own a 97 f250 460 5spd that i just installed headers on last weekend. i ended up breaking the elbow off in the drivers side manifold because it was rusted badly as well as the egr tube itself was rusted at both ends, not letting me break it loose from the egr valve. therefor, i completely removed the egr setup and installed a blockoff plate cut from 1/4" steel. i alsor gutted the cat, removed the smog pump and air injection, including all hoses and charcoal canisters. it throws a check engine light, but idles nice, runs smooth, and ive noticed an increase in mileage. i spoke with a tech at ford and he says for that truck, removing the egr will not hurt anything, wont run extra rich or lean, itll just throw a light because the egr is unhooked. also had the muffler shop make a new 2.5" ypipe, as opposed to the factory 2 1/8" one. i am very pleased with the outcome, oh and i used l&l headers and love 'em.

 

I don't think any aftermarket heads will work with the EFI intake and exhaust manifolds/headers. But the stock heads have plenty of potential to be ported, bigger valves, milled etc.

My machinist is going to mill about .020", do a 3 angle valve job, install new springs and do some mild porting. He said that by doing some quick blending in the intake ports and cleaning up the exhaust ports that I'll see 20-30 HP over stock. Looks like a total of about $500 for head work.

 

that sounds like a good plan i might steal it i was looking/wondering if the ford racing super cobra jet heads for the 429/460 could be swaped in they claim a big power gain

 

I did a 3 angle valve job a mild port job and installed 2.08 intake valves. the 87 to 92 E7TE heads came from Ford with 1.98 intake valves. the earlier heads and the latter F3TE heads all came with 2.08 from the factory.
Richard

 

Hey All,

I'm not tryin' to hijack the OP's thread, either, but I have a related question:

I have a 1997 F-250 HD 460 5-spd, SCLB, 4x4, and I wanted to know if the speed density system will or will not adapt to a set of long tube headers?

I probably only have the budget for headers, but not cam or other mods, and I want to reinstall the 02 (somewhere?) to maintain full emissions system functionality. I would guess that I would have to get a 3" exhaust (duals, if possible) but I wanted to know if the speed density ECM can compensate for the headers or not?

Also, where does the O2 sensor get reinstalled?

Lastly, I've read that ONLY Banks offers a set of long-tube headers for the 460 with the ZF 5-speed--is that true?

Thanks.

 

What I've heard is that the headers will lean out the mixture but the adaptive function of the speed density computer is able to compensate with no problems. Bummer your '97 isn't a mass air truck..