So right now, i wanna try and break the 300hp mark... at the crank. I've thought about putting a roots style supercharger on it and have found one for $350. But I was told (by someone here) that the intake is on the opposite side and it wouldn't work since its off a 01 cobra. So im putting the s/c idea on the backburner for now. So what should i do next? Do UD pulleys work any? How much of a power gain can you expect from those on our trucks? Is there anything else without spending a ton of money?
Thanks

 

300 at the crank out of a non-PI 4.6 is going to be tough and expensive. The cobra blower won't work on you engine because those 4.6's are 4 valves and yours is a 2 valve.

Swap some PI heads or go for some performance heads
Long tube headers
Full exhaust
custom tuning
Kenne Bell or Tork Tech superchargers

 

heres what i'd do, first talk to one of these tuners, Justin @ VMP, Mike @ Troyer, or Bill @ PHP, get a tuner with custom tunes, it's gonna be your best bang for the buck, and you'll need it anyway if you do a head swap.

here's a "stage 2" option, go to a junkyard and look for one of these: a 99-04 mustang GT, a 99-03 f150/ 5.4L V8, or a 01-08 f150/ 4.6L V8, and pull the heads, find a good after market RV cam (good low end) and pick up a PI intake manifold from summit racing, this will need a custom tune so talk to the tuner about this also.

should be somewhere around 300-310hp at the crank and be running a 10.1 comp ratio since non PI engines have pistons with a smaller dish. mustang guys have been doing it since the PI heads first came out.

 

#1 you need do more research and decide on a budget

#2 jimmysotherford has shown you a great tried and provevn way to gain power

#3 4.6 punisher has shown you basically the same thing and he addressed the exhaust factor for you

#4 if I were you I'd look for a used centrufigal supercharger kit for a '97-'03 F-150

 

How much pds with out forged internals? I already have full exhaust( Pacesetter LT's), Gotts intake mod. and then the gears of course. i for got sig didn't show

sry

 

Thanks guys
Labor wouldn't be anything for me. Me and my bro could do the work. (more him) Would my best bet be to invest in the said above (PI heads,cam,intake).or sell my motor/trans and invest in a Pushrod. Seem cheaper and good aftermarket. 5.0/5.8
Are ud pulleys/efans something that would give me any gain too?
thanks again

 

^^^^ All good suggestions posted above.^^^^

I would leave most of the truck alone and add a used centri supercharger, fuel upgrades,tuning and exhaust to see how that works for you..... you have 488's so that is in your favor. From there you can keep adding and have your tune adjusted as more changes are made.

Shameless plug: https://www.f150online.com/forums/pa...ercharger.html

 

Efans are a very nice hp saver....15-17 hp, Im told.

Sorry, we don't do push rods here.

 

Yea, that's what I heard w/e-fans. 15 hp gainer, but it's 15 you can actually feel.

 

you can't make enough NA horsepower to hurt your bottom end only about 400hp at the crank. is possible with your setup and what i previously alluded to, but that's a stretch. now boosted depending on the mileage i wouldn't go any higher than 400rwhp.

P.S. if you buy used PI heads and intake, take them to a machine shop and have them checked out, to make sure they're good. if you go this route you'd still save $200-300 over buying them new.

 

You can also bore and stroke it if you were willing to go for forged internals.

 

Ok. So if i were to do e fans and ud pulleys i could prolly gain 20hp?
I don't think i'd be satisfied with that but there pretty easy mods.

So it sounds like i have two main things i could do to put me over 300. The Pi route... or the FI route.. Jimmy, you said 300-310 with pi heads/intake/cams. And i could do up to 400, the FI route? (truck has around 100k)
I mean onelowf has his powerdyne for sale...hmmm. Can we put it to a vote? Each of ya tell me what you'd do PI or FI? I'm kinda leaning FI now.
Whatcha think guys?
Thanks again

PS My truck is about to have to start being my work truck on a daily basis. Within the next year or two hopefully. Prolly be pulling anywhere from 3-5,000pounds. Would a supercharger be a wise choice in this case?

 

not actually 400hp, i just said that if you have more than 100k on your truck i wouldn't recommend going above 400hp. also even with boost i don't think a non PI 4.6L can hit 400hp without engine and heads work. you'd be looking closer to 320-330hp at the crank.

if onelowf is willing to give you a good deal then go for it.

 

Thanks for the help bud

 

that's a good starter kit in the link