i have a 95 f150 w/ a 300 6 and a 5 spd 4x4. i do a lot of pulling with it, and, as stated hundreds of times, the motor is a tourque monster, but lacks a lil on hp.. i live in sw wi and pull a lot of hills loaded and need a couple extra ponies to pull em with. So I was wondering if i were to do 1 thing to add hp and tourque, what would show me the best gains.. right now i have a k&n air filter, and my exhaust setup is as follows; 1 cat, 1 hollowed cat and a purple horny glass pack.. also it has 3.55 gears.. would really liek to go with 3.73s but am kinda hesitating with gas as it is.. even at $2.22, it still would be nice to keep the mpgs just as high as possible.. any takers? any ideas/ comments would be greatly appreciated.. thanks in advance.. please keep cost in consideration.. and i really dont want to do an engine swap.. so i dont want to hear that.. thanks again

 

KEEP THE 300 MAN! haha...try getting your timing adjusted ... get it adjusted to stock first then you can go up to 4 degrees over i wouldnt go any further...that will pick u up a few extra horsies and some mpgs did mine today set it at 10, it was between 6 and 8 i cant remember what stock is though

you could grab some longtube headers and scrap the remaining cat with some bigger tailpipe that will throw quite a few ponies at ya

electric fans have been know for a few more mpgs

probably could get a more open air intake

hope this helps a bit some things i plan for my truck

 

nothing.


save up for an engine swap or do some real internal modifications to the existing engine or add forced induction.

 

+1. welcome to owning a 300

 

theres lots to do on these things mostly all little (expensive) stuff like if you want to get real technical and are a good motor head you could throw a turbo at it...junkyard turbo setups are fairly cheap and if you tune it right i doesnt hurt the mileage...theres a turbo 300 writeup in turbos/superchargers forum and that truck was dynod at 500 torgue with 260? hp i think and that was after he backed the turbo down

 

hotter burning spark plugs and wires, u could posabley put a bigger cam in it but im kind of new to 300s im used to 302s,351s,and 460s,anyways wack the other cat u would be better of without it, mybe u could try to bore it out a little

 

his 95 is speed density FI. as stated a billion times before on this forum, these computers do not adjust well to non-stock combos. Especially the cam.

If you really want power out of a 300 (espeically the FIs), youre going to do custom work or pay through the nose for someone else to do custom work. Think along the lines of a sbf or sbc V8 head + half of one welded together, custom sheetmetal intake, 65mm or 70mm TB and 75+mm MAF, headers + 2.5" or 3" exhaust, and megasquirt fuel managment. Oh and 19 or 24# injectors + at least a 110 lb/hr fuel pump. And lots and lots of tuning.






Or you could just swap in a 351 and forego the headaches. And exclusivity and uniqueness of your 300. And the debt.

 

Wow, didn't know I did that stuff to my engine. Building a pulling motor and a racer are two different things.
I would go with the 3.73 gears, that'll help you on hills. I have 3.73s in my F250 with a 360 and four speed, and it'll loaf along at highway speeds (75) getting the same 12mpg it gets at 55. I wouldn't expect a change in your mpgs, maybe even a gain since you won't have to downshift and rev it to get up hills as much.
I would also go with a larger throttle body, and better airbox with larger filter. You don't want to open up the exhaust too much, these engines loose a lot of torque that way.
To save fuel, I would go with a 235/85R16 load range E highway tire, run it near max inflation, and deal with the ride. A tall narrow tire like that will give less rolling resistance and the tread pattern is more of a radial groove design. Every note of tire noise you hear is energy being used, these roll along quietly.
You might also want to consider not having a 4x4 as a long distance towing vehicle, I know I dropped mine a few years back. There's so much more maintenance, more things that can go wrong, and that extra gear really costs you in mpgs. If you're towing in snow or mud, get a couple sets of heavy duty tire chains and a 2wd truck.