Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

I6 to 351w EFI question???

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Old Aug 8, 2007 | 04:55 PM
  #11  
JMD's Avatar
JMD
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From: AR
Default RE: I6 to 351w EFI question???

ORIGINAL: kj1977

the EFI parts on both engines are still in good working order. One being a little superior to the other. The Bronco rear end is an 8.8" and has drums on the back. Is the E4OD under the bronco to big to work on the mustang? I know that thing is a pig but it only has 3k on it after a ford dealer rebuild. I have also come across a performance rebuilt 302 (not sure how much performance just yet) here in town for $1200. I don't know the guy so don't have any idea if he is legit or not. would that be a better deal do you think? I am mostly looking for a winter project while this car won't be driven anyway and i can tear into it and not want to be driving it. I did a ton of reading on the 65-66 351w upgrade and apparently there are some space issues fitting it under there and getting to the plugs etc. after the headers are installed (which some had to have modified to get to fit). I haven't picked up anything that deals with the 67 upgrade. is that because it is much easier and had the same front end as the V8's, minus suspension? Please say yes?????
I am going to step out on a limb regarding the 67 front suspension,, I have heard lots about this, what I have gathered is that the 67 I-6 suspension and steering is thesame as the V-8,with the exception of the springs and sway bar. If you have 5 lug wheels on your car this would tend to support my position.

I have also heard that there is plenty of room in the 67 engine compartment for a 351, the fit in my son's 66 ain't that bad, but we did modify the swap headers a little with a hammer. .... Even in the 66, given the choice to change the spark plugs 10 times in the Mustang, or once in my brother-in-laws 88 Trans Am,,, I would change the plugs in the 66 10 times.... it ain't that bad. My son and I each took a side and we installed all 8 in about 10 min, all from the top, with a 3/8 ratchet, 5/8 spark plug socket and a 3/4" wrench, nothing special. Another inch on each side and the headers and plugs would have been a breeze.... I think a 67 gives you this inch.

For a 67 I would go with the 351, especially if you are looking for a winter project. My sons and I had a ball rebuilding our 351... You can build a 351 on the cheap, or spend more if you desire... The extra 50 ci, is cheap easy HP.

BTW,,, even at worst,,, factory I-6 and V-8 cars are identical with regard to their body and "frame" construction,, any differences are strictly "bolt in", and everything of substance will bolt in without even drilling a hole. this I know for sure..

It is not a hard project. it can get expensive, but this can be mitigated to a large degree by utilizing someused components... I know the list on the FAQ looks daunting, but it is not that hard if you can turn wrenches...

Oh,,, and the transmission,,,, that trany has a transfer case right? I don't know if these are easily seperable from the trans, but if so, there are lots of good reports about AODs in Classics.... (I assume we are talking AOD...)
Old Aug 8, 2007 | 04:57 PM
  #12  
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dcohen
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From: Salisbury NC
Default RE: I6 to 351w EFI question???

bronco's have 8.8 inch axles

they used 9 inch axles in heavier trucks like the f-250

and e40d's are some stought transmissions, but you have to realize that the engine is coming from a truck, so its gonna be built more for torque rather than top end

change the cam and maybe the heads and you will be MUCH happier with the performance
Old Aug 8, 2007 | 09:24 PM
  #13  
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petec
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Default RE: I6 to 351w EFI question???

Drop the Windsor in the car. As we used to say, "there is not sustitute for cubic inches except cubic feet".

If you want a daily driver and are not really worried about performace you can simply bolt a dual plane manifold and 600 cfm carb on it. If you want a little more you can put a mild cam in it and headers if you feel like it.

Since you have two Windsors why not just put one in to drive around and build te second and then it is a really easy swap when you want the power under the hood.

You will need a V8 radiator and engine mounts. The springsare the same between I6 and V8 for that year according toFord part #C7ZZ-8306-AR

If you have an 8" rear now you'll be fine for even a mildly built 351. I had 330 horses pumped through a 7.5" rear in my '85 Ranger that made regular trips to the drag strip so don't believe all the hype that you need a 9".

All that being said, go and enjoy your car. It is an easy swap once you gather up the parts and know what you are going to do, and it will worht it when you stab the tall skinny pedal for the first time after pulling the 6 out.
Old Aug 10, 2007 | 08:28 PM
  #14  
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kj1977
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Default RE: I6 to 351w EFI question???

thanks for all the info. I have one of the motors torn down and am going to do some asking around about the best machine shop to use in town. Once the block has been looked over and is given the thumbs up I will start to look into what kind of rebuild kit I may want. One other question I had was whether or not the C4 transmission will bolt up the the 351w. do any of you have a recommendation on where to buy the rebuild kit and possible some moderate ($$$$) upgrades that would give a few more horses for a minimal price. I intend on doing a mild cam and headers but beyond that I am open to suggestions.
Old Aug 10, 2007 | 08:44 PM
  #15  
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petec
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Default RE: I6 to 351w EFI question???

The 351W has the same bellhousing pattern as a 302 and the C4 was put behind a lot of Windors over the years. I had a buddy who used to run C4s behind a serious 351C 4V in his drag car and if they are prepped properly will take a good pounding.

Make sure your cam, intake, and carb choices match your torque converter and rear gears. Nothing worse than a mismatched combo. You'll be happy if you stay conservative on everything as opposed to going too big, unless you want to give up some streetability.
Old Aug 10, 2007 | 09:41 PM
  #16  
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kj1977
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Default RE: I6 to 351w EFI question???

do you have a recommendation for a combination that works well together?
Old Aug 11, 2007 | 01:40 AM
  #17  
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andrewmp6
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Default RE: I6 to 351w EFI question???

yes the bronco rear end is too wide would have to be shortened engine tranny wiring harness ecu maybe the radiator if you dont mind making mounts for it.
Old Aug 11, 2007 | 10:04 PM
  #18  
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petec
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Default RE: I6 to 351w EFI question???

What is you rear end ratio and compression ratio? That is where you start and we can build around it.
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