My question is are the late 70's 351w the same as the fuel injected late 80's to mid 90's 351w. I would like to know this because I plan on swapping out my 351m for the late model fuel injected engine and then converting it to MAF. I would also like to run the old style waterpump with V-belt system rather than serpentine setup. I just think this would be easier for the powersteering hook up. Also need to know this for the flywheel. I plan on keeping the c6 but I think the flywheel is the same on the 351w and 351m. Not sure if that flywheel will work on the newer engine. Accordin to the ford racing website the 289, 302,351w,c,m. all use the 164 tooth 28 oz flywheel are the 88-93 351w use the same flywheel? My vehicle is a 1977 f150 4x4 351m/400 and c6 tranny. Any help would be greatly appreciated.

 

the 351m and 351w are to different motors so nothing between the 2 are interchangable.

the c6 was mated to many 351w's so getting the right flexplate shouldnt be a problem. best bet would be to find a complete 351w from 93 and older at a wrecking yard. check out www.fordfuelinjection.com for a mass air kit at a great price.
i would keep the serp setup.

 

351w 289 and 302 up to 81 uses 28 oz flywheel with the number of teeth dependent on the trans used.81 and up 302 uses 50 oz flywheel. Not sure about the 351m and 400 but I think they are internally balanced engines.

If you have a 351m then the c-6 is the large bell housing bolt pattern and will not bolt up to a 351w and the flywheel will not work. You need a small bell housing c-6 or if you can get the complete setup for the fuel injected 351then swap whatever trans is in the fuel injection truck.

 

It will be harder to find a small block 4X4 C6 trans but you can take a 2 wheel drive small block C6 and take your big block C6 and switch the guts over. You have to do this because the output shaft is different on a 4x4 from a 4x2 trans.

 

Hey guys thanks for the info you think advanced adapters carries an adapter for the AOD or E40d depending which would be in the truck to adapt to my np205 I would really like to keep it in the truck I looked on their website but didnt see any info on them. Has anyone done this combination?

 

The E40D was offered behind 460's if I am not mistaken but it will need a computer to shift it correctly. A while back I think I had run across an after market computer that would run the E40D trans in a non computer car/truck. I have no clue where i read this at but at one point I was thinking of installing an E40D in my 78 bronco to get a OD gear. I now have a ZF which I will install instead.

 

either stick with the c6 or go manual ZF 5speed tranny. dont bother with the e4od or Aod. they are good trannys but for your application and the setup involved probably isnt worth it.

 

Just use a v-belt timing cover & water pump and accessory mounts to do this, no problems there. The serpentine PS pump should be able to connect to your PS setup with no problems if you choose to go that route, the PS pump didn't change much over the years, just mounting and pulleys.

 

he will need some sort of fuelpump block off plate if he uses that type of timing cover

 

I would like to keep the c6 but I want to have overdrive. And my c6 wont bolt up to the 351w or I guess I could swap in a efi 460 then I would be set but then the gas mileage would work out to be the same as I have now. It is one big dilemma sooner or later I am going to have to get a new truck or modernize what I have.What kind of mileage do you think I would get if I kept my current setup but just add a gear vendor od unit. Current highway 8-10 mpg. I turn about 2600rpm at 60mph.

current setup

351m bored .030 w/400 crank
high energy 260h cam
36" tires
4.11 gears
c6 tranny

 

In regards to your response.... there is a buddy of mine that gave me a idea for my ranchero... which is to put a 89 351w in my ranchero.... i am down for this idea because i know the windsor from 89 puts down a beautiful wopping 250hp stock.

Will the 90's windsor bolt up to my 75 c6? the 13 mpg is well worth it in the long run..... that kinda hp can put me in the line against fast acceleration cars...

 

I've owned 2 EFI 351 4x4s automatics, one of them I bought new. They both got horrible mileage.

 

with a 1975 ranchero and having 250hp under the hood by adding a new 351w why would you need to care about mpg.... searching for a 351m/400 is not worth the time in a swap... if i am going out might as well go for broke.

 

WRONG!! The 351W's never went to the 50 oz flywheel(or flexplate) They kept the 28oz throughout their production run. Which is also the same imbalance used on the 351M/400.

 

Depends on which 351 your Ranchero came with. If it's a 351M, then no, you'll need a small block C6. The 351M/400 used the same bell pattern as the 429/460 (with the exception of a very few 400's, which used the small block pattern) If you're going to swap to a 351W, then get one out of a 95-97 truck, these came with roller cams, same cam used in the 96-2001 Explorer/Mountaineer, which is just a tad less cam than the HO roller.