Swapping a 351W into a truck with a 302?

I put a 1996 E250 5.8 into my 1995 F150 5.0. It works great.
Did not change or mess with the ECU.
I pulled the engine complete with the wiring harness and everything related I could. The power steering and AC brackets are specific to 351W's because the engine is a bit taller and wider at the top. This also effects the exhaust fitment.
My truck has a 4R70W that I like. 5.8 trucks are "supposed" to have E4OD transmissions, which I don't like. So I've got the combo I want. Unfortunately the ECU's for 4R70W trucks are different from E4OD trucks so I couldn't swap in a 5.8 ECU if I wanted to. Shortly after the swap I laid down about a 45 foot long black mark on the road in front of my house, so I don't think I'll worry too much about messing with the computer. (Old 5.0 would barely spin a tire.) My next mod was a traction-lok rear end swap. Very much shorter dual black marks now and I wouldn't swap the truck for a new one. Engine swap was about 18 months ago and it's daily driven. Next mod I want to do is headers but the kind of odd van EGR setup I ended up with limits my choices to shorties unless I engineer something. I'm thinking about it.
BTW, 302 and 351W pistons are the same "size". A 351W has a longer stroke. Longer stroke equals more torque. More torque plus truck equals smiley face.

If you swap year for year- the computer will work, but it will not have all the power of a 351 because of the fuel curve programming. So the right computer is a must.
The rest is a direct bolt up, they are both Windsor family engines so the bell housing will be right, but there might be a problem with the exhaust down pipe. The down pipe should pull up to mate to the exhaust manifold.

If you use the ECU from the 302, you will need to have it reprogrammed for the 351W. I doubt the 302 tune will run the 351 at all, I could be wrong. This isn't a great place to ask this question, find an internet forum dedicated to fords or F-150s and ask there. This swap has been done before, and someone has done all the research already. You should be able to use the same tranny, though.

http://www.allfordmustangs.com/forums/5-0l-tech/227625-5-0-5-8-351-engine-swap-information.html

302 To 351w Swap

U will have to have a 351w intake for sure.Its alil wider than the 302 intake.U might have to get the mounting brackets for ur altenator and power steering depending on which one the 302 has they may work.oil pan.valve covers,exhaust manifolds will all work just fine.Also u need the 351 flywheel.U need the computer to a 351 for ur year model truck.The computer is in the cab on the drivers side behind the kicker panel.Thats all u gotta have other than maybe a few minor things.

I SWAPPED COMPUTERS ALONG WITH MOTOR. TROUBLE I AM HAVING ,BLOWING POWERPOIT FUSE AND DASH GAUGES FUSE. THE HARNESS BESIDE THE COMPUTER HAS MOORE PINS THAN THE 302 . SHOULD I REMOVE THE PINS ON THE HARNESS OF 351 PLUG TO MATCH THE 302 PLUG .

This Site Might Help You.

RE:
Swapping a 351W into a truck with a 302?
I have a 1995 f150 302 MAF and I was tossing around the idea of replacing it with a 351W of the same year. What would I need to do the swap? Would a need a computer or with the one in the truck now work? Will I need to upgrade the transmission? Will the engine operate as it is supposed to or will...

engine wont run successfully BUT the 351w is taller and more narrow than the 302w anyway but there are enough bits around to modify them. or buy a crate stroker engine. and you will get the power that the little 302 is lacking for you.

Physically it will swap right in, it uses the same motor mounts, and you can even keep the accessories from the 302, only real difference from the exterior of the engine is that the 351W is slightly taller. If you have the E4OD transmission, which was very common in 1995, then can keep the ECU, but you'll want to have a custom tune burned for it, as the stock tune will cause the engine to run lean constantly.

if both engines came out of the same yr. then the computer should be okay ! a 302 and 351 windsor are the same engine, except the pistons are a different size ! your transmission should bolt up to the 351 because both engines are small blocks ! once the 351 is installed you should see a little bit more horses as long as the compression in the 351 is good ! you might have to use the exhaust manifolds off the 302 if the 351 manifolds are not bent right for the exhaust pipe to hook up !