sionix

you can get up to 1700hp out of a four six so far, thats the highest hp rating of any four six and yeah, its FI, go figure

OUZBnd

I would bet it is going to be much easier/cheaper to get the 350 to higher horsepower.. 350 is a good motor. My gf’s dad has a built N/A 350 that makes 527 hp.. I cant see a N/A 4.6 making those numbers without some serious cash.

Good luck though. I think its just going to come down to who has more $$$.

Birdieman4

4.6 engines have their own 'plateau' thresholds for hp and needing certain things. The first is w/o forged internals, and that safe limit is around 450 rwhp tuned. If all the internals are forged, then without doing anything else to the motor, I feel the 'safe' rwhp is around 600. After that a lot needs to be done to support, say, 800 rwhp. After around 600 rwhp, you'll start blowin valve seals and stuff unless you update that 4.6. Targeting a rwhp of around 550 is safe on your stock block, as long as your internals are forged.

Dan04COBRA

There's no replacement for displacement.

Sidewayz6.0

He is correct. Those TPI motors are crap from the factory, but with the mass selection of parts available. You'll never be able to keep up. Assuming you've both got the cash to play with the big boys.

It'll cost you twice as much to make the same HP it does him.

PonyRider98

well, damn, sounds like I neet to invest in a cobra......*sigh* I might as well just wait till the '07 ones come out, buy one and make that fast...I'm sure by then I'd have enough money.

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Acer2428

I need a 5.0 swap....

But no one seems to have any info?

DeViouS

Hey thats my sayin LOL. Ya that would be nuts havin a 600rwhp stang, the first thing I would do if i ever got a lot of $$$$$ i would do everything possible to my stang. I also dont thing it would be street legal @ 600hp cuz isnt the limit like 500hp or so? plus the exhaust fumes alone would probably fail u.

BCisme

a 4.6 block will only handle about 600 hp, and that's at the crank. don't bother with forged internals, your best bet will be a whole new shortblock. buy yourself a VT 302 stroker, with a head and cam package, a new tranny and a blower. also some suspension, lots of tuning, and many other various things you will need to change. you'll need about 25G's. better off buying an 03 cobra and slapping a KB on it. all your buddy has gto do is drop in a nice 502 chevy crate motor, or a built 350 with a blower and you are gonna have problems.

angcobra

Depends on what RPM you make the torque, if you make it down low (ie roots or screw blower) you will have a harder time keeping the tires hooked up if you get in it in lower gears.