What is the biggest possible engine I can put in a 91 Mustang GT?

Question

I have a 5.0 91 Mustang GT looking to put a bigger engine in it. I know I can swap to a 351 but I heard I can put a much larger engine in the mustang. Not worried about the price or trouble just what is the biggest possible engine I can put in my 91 Mustang GT? Heard I can fit in at least a 502 or larger...so any help on this matter would be great.

Answer 1

first of all dont put any huge chevy into it thats for sure why do you want all that extra weight up front, get another ford 302, forge the bottom end and throw a kenne bell blower on it, you will have a bad *** street car with great hp and GREAT torque, also if you wanted too you can get ahold of a 03/04 cobra motor, my friend has a 88gt with a 03 cobra engine and took the factory supercharger off and replaced it with a kenne bell making well over 550 rwhp and 575 rwtq....anyways just stay with the lighter ford engines plus they handle boost alot better than gm engines do

Answer 2

Yes you can fit a big block in it!! My buddies and i usually put 429's in them when the 429 is available.If not we use the 460.These motors will take up alot of the space under the hood because fox bodys never had much to start with.You will have some brake master cylinder issues.You will have to relocate it or have to buy a smaller booster or just take it off and run non-power brakes.Next thing is the headers.They are an extremely tight fit.The other thing is the front suspension.It will need to be beefed up a bit.The stock springs were only made to hold a small block.When stuffing that large motor in there,most of the weight of the vehicle has been transfered to the front of the car which isnt good considering your gonna need all the weight of that little car to be in the rear for traction.Put the battery in the trunk too.There will also be some diferential concerns.A stock 8.8 mustang rearend will not hold up to a big block with any power.A good spool or locker will need to be put in it along with some hi-po axles.We use Superior axles here.Last,you should weld the axle housing where the meet the differential on the outside.This will strengthen the rearend.After all you could just have a Ford 9" made for it which will eliminate almost all concerns of ever blowing the rear apart.You can sometimes find these rearends already made for fox bodys on Ebay.Also remember,your gonna need a tranny for this swap.A C6 Ford transmission is what is made for the big block Fords.These trannys are large and heavy and you will lose 60hp at the rear wheels just to turn it.We personally use the small block C4 tranny here with aftermarket adapters for the bell housing to bolt up to the big block.A C4 tranny only takes about 20-30 hp away from the motor,If you can find a rare C5 Ford tranny,GRAB IT!! You'll understand why after reading up on it.If you want to be different and money isnt an issue,keep with the small block.They do make a twin turbo for the 302 5.0's.Best of all and something i've never seen in person but i know they make is a twin supercharger model.This is available from Paxton for the 5.0.Take your pick!!If you think about it regardless if money is not a problem or not,keep with the 302.The money saved from not having to fabricate anything or buying a big block and tranny can be put in all the aftermarket stuff available for the 5.0.There are tons of mods for this motor.You can generate an endless amount of horsepower with these engines if you know what your doing and also depending how "deep" your wallet is.Good luck buddy,i hope some of this cool info has helped.After your car is done,you may want to keep alot of spare tires around for the rear.LOL!!

Answer 3

I've 460's stuffed into them but it took a lot of sheet metal work and some frame modifications to get it in, And it was only good for drag racing because of car being so unbalanced in weight it didn't handle good on the street. and was murder to handle on wet streets because of all the weight being up front.

Here is a little known fact about Mustangs. When they first came out with the new generation Mustang 5.0's =you could them with a turbo charger. Texas DPS bought a bunch of the Turbo charged models for their patrol cars and radar cars.
That lasted only six months until The Texas DPS started jerking the Turbo charged engines out and replacing them with regular 5.0 engines because the officers driving them were having too many wrecks, and burning up too many tires.

But before you go spending a ton of money just remember this. No matter how large a motor you stuff in it you are not going to out run a police radio nor police copter.

Answer 4

This is a great car to do a motor swap....it can simply fit pretty much whatever you want with minor body mods and or frame work......a 418 would be pretty nice and would probably be up for whatever you could throw at it..... If this is going to be mostly a street car I would recomend building something smaller like a 347 with good compnents and dropping a set of twin turbos on it....should make1000 hp + :) should be enought to handle the competition!!! Just keep in mind that with the larger you go...the more custom made parts will have to be made...:( Money pit

Answer 5

Yes you can do it pretty easy and cheaply, being an 05 there are probably some in scrap yards by now so all you really need to do is find one that isn't wrecked in the front end and just get all the engine bay parts and transplant them into your car, its a pretty straight forward process. Doing it that way will probably cost you something around the 2500-3000 dollar area. I wouldn't worry about trying to modify your V6, they don't make many parts for it so your kinda stuck with expensive boost options. The V8 will be much cheaper in the long run. Good luck.

Answer 6

U could fit a 460 but it would be alot of work to make room for it. The 460 is a big block and your 302 is a small block and its a big difference. But u could get just as much hp out of a small block as the big block. You said price was no worrie, so just build a small block, bore the block, alliuminiem heads, a cam and intake. Bolt up a suppercharger and there u go.

Answer 7

The 347 stroker is the best option and fits right in, but there is a expensive 427 that is made of aluminum and based on the small block Ford. :)

Answer 8

460 block or a 4.6 dohc 460 is 27 inches wide and the 4.6 dohc is 30 inches wide the 460 can be stroked past 514 cu in weighs 720 lbs. the 4.6 weighs 576

Answer 9

Have you thought of keeping the 302 and making it a 347 stroker motor? It would make huge torque numbers with less wieght than a higher displacement motor.

Answer 10

if price is no problem, i'd say a 429! if it doesn't fit, you could shoe-horn it in like Ford did with the '69 Boss 429! but also make sure that whatever you get you can get EFI, carbureted engines' rough idle is awesome, but fuel injection adds so much more horsepower!!!