4.6 to 5.8 swap

[Rainmaker106]

i got a 2003 stang and was wounderin if a 351 can use the same mounts as 281... any one know?

 

[BennyBlown2v]

No they don't - but aftermarket K-members (engine cradles) are available from companies such as AJE which will fit the motor you like (or hell, even chevy smallblocks haha).

 

[bdcardinal]

agree with what benny said. also you will have to completely redo the fuel and ignition systems. if this will be a street driven vehicle, in most states you will not be emissions legal.

 

[Gearbanger 101]

For what it's going to cost you to properly swap the motor, spend it on a blower and don't look back. Guys are getting totally streetable 600rwhp out of 4.6L Modular cars now a days. It's not worth the time, money or effort to swap back to an old low tech OHV set up.

If it's not going to be a street car, then I suggest you sell off your current GT and start from scratch with a rolling chassis from a V6 car. It'll likely be cheaper in the long run.

 

[Rainmaker106]

not going back to a carb ima stick with efi. i would never put any carb engine in any of my rides

 

[Gearbanger 101]

......who mentioned anything about you having to convert backwards to a carburetor set up?

 

[Rickey_Bobby]

Forget money, I hope you are retired, because all the little things you would need to do add up... To a lot of time.
If your doing this to be different, then consider a 5.4L triton motor (2V) or a 5.4L navigator motor (4V) if you got $$ to spend. They will drop right in, all you need is a taller hood and some wiring, and different x-pipe/headers, and computer/custom chip, and....
All in all, still a LOT cheaper and easier than what your thinking.

...stand alone fuel system with tuning is more than a 4v 5.4L motor alone.
And you'll have $$ left to put a twin turbo kit on it and some forged pistons... Lay down a few billion ft/lbs of TQ.