[5-0stank]

i can purchase a complete older 351w motor that is carb for a pretty low price (as in 100+ dollars, not sure yet) i have a fuel injected car and do not really want a carb daily driver, even though i do not use this car in the winter. i was wondering if i could put a fuel injected manifold and all the rest of the efi parts on, without a problem. i know my 5.0 manifold will not fit, but is this possible w/ an aftermarket efi manifold??? can i use my stock ecu??? most likely this motor would be a stroker w/ h/c/i. could i bring any of my front accessories on to this motor? it has a v-belt

thanks for your help!

[88BlueGT]

You should be able to bolt all of your accesories up to the 351W. Im not sure which bracket but there is one bracket that you will need to shave down (or buy one from ford racing). The lower manifold will not fit but the upper will so I would look into getting yourself a nice trickflow, edelbrock, etc. u/l manifold. Also, with the 351W you will need a new pan, headers, and a few other very small things. You should be able to convert it EFi by just strapping everything right on. Also, yes I am pretty sure you can use your ECU from your EFI car that you have now. I will post a nice little tech article on 351W's.

[88BlueGT]

The 351W is a Windsor class engine. It is made on the same factory line as our beloved 5.0. However, the 351 posseses several qualities that make it a desirable block for an engine buildup. The advantages of using a 351W vs a 5.0 (302):

Obviously, you get an extra 49 cubic inches of displacement. As the saying goes, there is no replacement for displacement. Second, the webbing in the lower half of the block is thicker, making the block stronger. Third, the crank has bigger main and rods journals, making the cranks more durable than their 302 counterparts.

FACTS: What you need to know/consider when you swap a 351W into a Fox3 platform chassis:

The 351 block is very similar to the 302. That means that almost all parts swap between a 302 and a 351. This includes: Heads, cam, lifters, timing chain, timing chain cover, water pump, engine mounts, and all sorts of other stuff. The bellhousing bolt pattern is the same as a 302, so all trannies that bolt to a 302 will bolt to a 351. However, there are some differences in the 351 that necessitate new parts:

1) The oil pan is different. Motorsports carries one. You can also get an oil pan of of an early eighties LTD Crown Vic. If you go the junkyard route, remember you also need a oil pan pickup tube, and a special main bolt that the pickup attaches to. The FMS pan is a pretty good deal, and if you shop around, you can get one for under $100, which comes with the dipstick, bolt, and pickup tube.

2) The internal balance of a 351W is the same as pre-81 302's (28.2 oz). The 5.0 HO has a 50 oz. unbalance, which means you cannot use the flexplate/flywheel or the harmanic balancer off of an HO engine. You have to get the correct pieces from a dealer/junkyard.

3) The deck height is higher, which means you need a different intake, since the 351W intake is wider. A 5.0 Upper will bolt to a 351W lower.

4) Also, a higher deck height means that the accessory bracket will need to be replaced. FMS sells the new bracket for about $50.

5) The higher deck height means the headers sit up higher than in a 302 powered Mustang. A special set is required for a 351.

6) A 351W will in all likelyhood not clear the stock hood. You will need a cowl hood for your car.

7) The distributor has a fatter shaft. You can obtain one from a 351W powered FI truck (if you are using FI) or any late 70's/early 80's car using the 351W and a Duraspark system if you are going to build a non-efi car.

Those are the major differences. As you can see, for about $1000 you can put a 351W in your Mustang. This is cheaper than a stroker, plus you wind up with a more reliable engine.

Tips: There are several things to look out for to ensure that your swap to a 351W is easier and more successful. They are as follows:

1) A high volume oil pump WILL NOT clear the FMS pan. If you want to run an HV pump, you must either modify the pan, or buy a Canton or similar pan, for many dollars more. The modifications just include cutting down the front drain bolt, and welding on a corner to the pan to clear the pump housing.

2) Get new motor mounts. If your mounts are questionable already, the additional weight of the 351W will make them fail in a hurry. I recommend the 87-93 convertable mounts, which will work in any 79-93 Mustang.

http://www.fast351.com/tech/351w.htm

[5-0stank]

are there any changes from swapping the 351w into a sn95 instead of a 79-93 mustang???

[ChrisJ]

PM CMY4D...He should be able to give what info you need...

[Justincredible]

Originally Posted by 5-0stank are there any changes from swapping the 351w into a sn95 instead of a 79-93 mustang???

I did a 351 swap into a sn car...everything on the list above is true to this swap, except #4. You can use all your stock accesory brackets with no problems. You'll just have to get a longer serp. belt to make up for the wider spacing of the componets.

Its realitivity easy swap. Good luck.

[ChrisJ]

I have heard of quite a few people doing the swap...

It would be one fun car with the swap...

[5-0stank]

yeah...i really want to do this swap, but i am not sure if i will beings i am 17 (i am mechanically able, but my father does not want me to spend a ton of money before college) but this swap would probably cheaper than heads/intake/maf/injectors, etc. on my 5.0

and another question...Can I use my hyd. roller cam in a stock 351w block?

[88BlueGT]

I dont think you will have any problems using the stock cam. Also, theres not too much of a difference in power from a stock 302 to a stock 351W... I dont think so anyway.... if anyone has any information on this please feel free to share.

[5-0stank]

i just figured my stock 302 (HO) cam would make more power than the cam from the old carb 351w, and do you think i should use the heads from my 5.0 or use the ones that already on the 351w?

[88BlueGT]

Use the heads that are already on the 351W if you get them. They are a little better than the stock ET7's. If I were you though I would definetly look into a set of aftermarket heads if your budget allows.

[5-0stank]

Haha, another question for ya...would hooker shorties made to fit the 1995 cobra r fit my 351 (i dont see why not) ? they are on summit for like $220

[davidnc]

How did you extend the EFI fuel rail cross over lines and not have them rub/touch anything?

[Justincredible]

Originally Posted by davidnc How did you extend the EFI fuel rail cross over lines and not have them rub/touch anything?

I used a set of aftermarket rails from UPR.

[TurboLX]

age has nuthin to do with it at all im also 17 as well and i have a 351w with a twin turbo and if you have a 351 block and a 302 EFI complete you should be able to take every thing off the 302 an put it on the 351 but iwouldnt use the pistons,cranks etc over again just find a cheap rebuild kit i know autozone has them from $250

[5-0stank]

yeah, i know...i have the ability and money but as i stated before my dad doesnt want me to drop a ton of money before i go to college

[TurboLX]

oh thats true actully i just got a scholarship to college

[5-0stank]

Originally Posted by TurboLX oh thats true actully i just got a scholarship to college

cool man...im tryin to get one cuz i did well on my sat's (1360 old way)

[Tony_90fox]

haha, i got a 1360 new way, but i still get my tuition paid for. you must be a pretty smart person. So, where you guys heading to college? I go to Western Kentucky if either of you were stopping by, shoot me a holler.

[5-0stank]

im probably goin to stay in the north east...lookin at drexel, pitt, lehigh for mech. or electrical engineering