74 engine swap

Discussion in '1974 - 1978 Mustang II Talk & Tech' started by 74stang, Apr 23, 2004.


  1. 74stang

    74stang New Member

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    hello fellow mustang drivers! i am new to the mustangII forums, but ive owned a 1974 mustang hatchback since i was 16. i love my car as only a mustangII driver would. :flag: my question is whether or not i should swap out the 4cylinder for a bigger 8. the 4cyl. is the original and it was overhauled in the 80's, but that is it, besides whatever upkeep i did. is there any huge reason why i should keep the original motor?

    74stang
    #1
  2. 85MustGT

    85MustGT Founding Member

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    Get a 5.0 drivetrain for that car! :spot:
    #2
  3. 78CobraII

    78CobraII Moderator

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    A couple of questions for you to think about while making your decision:

    -How important is originality vs. performance?
    (i.e are you more likely to show or race your car).

    -How good are your mechanical skills?
    (i.e. can you do the work yourself or will it be farmed out)

    -How much money do you have available for the project?
    (related to the previous question)

    And here are some options in rough order of expense and difficulty:

    1. Hot rod your current 2.3L engine
    2. Transplant a Turbo 2.3L EFI engine
    3. Transplant a 302 or 5.0L 4bbl engine
    4. Transplant a 5.0L EFI engine

    Your 1974 has an additional issue in that the radiator support is too close to the location of a 302 engine to get a radiator in the usual place, requiring either placing the radiator on the outside of the support or changing the support to the '75-'78 type. This makes options 2. and 3. a lot closer than they would be for the later MII's. For the later MII's I would reverse these two options.

    Another way to bypass the engine compartment issue would be to choose a more exotic (i.e. untried :D ) engine swap. The 3.0L or 4.0L V6 and 3.8L engines would fit without moving the radiator support. But all three pretty much require EFI.

    The easiest way to do any engine swap is with a donor car present to remove parts from. The MII is a pretty easy car to swap engines in because all three factory engines used the same basic front-end parts, with only wiring, springs and the engine stands being different.

    Let us know which option you would be interested in and we can discuss in more detail.
    #3
  4. 74stang

    74stang New Member

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    wow, thanks for all the info 78Cobra! i havnt even thought of that many options. with the radiator problem how hard would it be to transplant a 302? that was the option i was most leaning towards(call me boring) because it seemed the easiest:price, availability, knowledge. the 2.3 turbo would be sweet, but ill probably stick with the 302. how much harder would a 5.0 transplant be, if any?
    thanks
    74stang
    #4
  5. 74stang

    74stang New Member

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    sorry about the smilely face, it was supposed to be a colon with the word, price, after it, stupid computer.
    74stang
    #5
  6. 69stang351

    69stang351 New Member

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    hey, i have an original 76 cobra II w/ a 2.3L from factory, I am seriously debating swapping it out for something else... but im not sure because I dont know how many cobra II came with them in 76 or how many are left out there... also I wouldnt mind modding the engine in there after a rebuild to make it more powerful because the stock 4banger isnt enough for my enjoyment but it will be just fine if I decide to show it as original if there arent that many out there like mine. plz advise...
    #6
  7. JonDawg

    JonDawg Mstng2 supplied me with my pair Founding Member

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    Im just finishing a 351W swap into my '74. Its been a 6 year project, and its cost about 3 grand (me doing almost ALL the work) so, judge for yourself..... Do you have all the time needed?? Do you have the funds?? (I did rebuild the motor, and the auto trans (AOD)) ......and the cutting, welding, hammering, general frustration, trying to find headers, upgrading the rearend (if needed) etc.
    Plus with a V8, your front end is quite a bit heavier, you may need new springs and maybe brakes. then the car wont handle as well.
    If you want a manual tranny, your best bet is to find a MII bell housing. Ive seen one in my life!

    Im not trying to discourage you, but its a LOT of work. Where I think a turbo 4 would be a lil easier. of course, its a lot more wiring. :shrug:
    #7
  8. 78CobraII

    78CobraII Moderator

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    There are a bunch of folks hotrodding the 2.3L for dirttrack use. A good one can make in exces of 250HP, but at RPM's (7000-10,000) that would not be useful on the street.

    I scanned an old magazine article on hotrodding the carb'd 2.3L which has some good advice on levels of tune that would be usable on the street. I am working on a combination of their Stage1 and Stage2 which should be worth 150HP or so at a more streetable 5500RPM.

    I'm basically looking at about 10:1 compression, a 4bbl carb and intake, a hotter cam, and a header. Should be OK in a 2800 lb car with a 4-speed.

    Here's the link: http://www.dpo.uab.edu/~bmclean/pages/m2_faq2.htm

    There are several folks that have installed the carburated 302 or 5.0L in a 1974 Mustang II. Here is a link to one: http://www3.sympatico.ca/craig.robertson1/

    The '74 MII has a radiator support panel that is straight across the engine bay. The '75-'78 radiator supports have an extension towards the front to provide more room for the V8. You can either mount your radiator to the front side of your current straight-across radiator support, or transplant in a '75-'78 radiator support, or build something custom. With the last 2 cases you will need a new method of holding down the hood as the stock hood latch will no longer fit. I've seen several folks using hood pins.

    This amount of custom work is not a lot (considering that you are putting a V8 in a car not designed for it), but its why I asked about your skill level and resources. The MII is relatively easy to swap engines in. You just have to mind the oilpan sump as the rack and pinion cannot be moved.

    Remember...doing an engine swap with a donor car makes it MUCH easier. I'd be looking for a '75-'78 V8 MII that's not running to pull the parts you need.

    Good luck and let us know what you decide!
    #8
  9. Mstng2

    Mstng2 Founding Member

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    I did the 302 swap in a 74 Mach 1 that I had. You CAN use the original front end and radiator support. I'll tell you how I did mine and you can decide from there. You have to get a custom radiator built that is actually longer than the original for cooling purposes. (dont do the radiator until the 302 is in) When you install the 302 either omit the fan entirely and use electric on the front of the radiator, or do what I did and remove the fan spacer and use a HP flat flex fan. bolt it directly to the water pump. This leaves an amazing :rolleyes: 1-2 inch gap between the fan and the radiator. The bite is this, if your in a fender bender the fan IS going grind the snot out of the radiator. Which is exactly what happened to my poor 74, may it rest in pieces.
    But since it was totalled anyway it didnt matter. Sooo as everyone else has said you have to decide but my vote is for a V-8!! :nice:
    Theres no replacement for displacement!!
    #9
  10. Laslo

    Laslo New Member

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    Hi everybody, i just had to join the forum because i stumbled upon this thread when looking for engine swap stuff on google.

    I bought my 1974 stang after someone already did the engine and trannyswap, but what i didn't know was that there was some small (but anoying) problems i (still) have to work out to get it through swedish inspections.

    My biggest dilemma is that the exhaustpipe connected to the original ford exhaust manifold, shafes against the steering column (see picture).
    My question is: What type of headers did you guys use on your engineswaps?

    Exhaust01.jpg

    Can you recomend blockhuggers? And would i have to tinker with my enginemounts to get those to fit?



    Heres my baby in its present condition: http://www.metasyntactic.se/mustang
    #10
  11. joeythesaint

    joeythesaint New Member

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    Laslo, V8 blockhuggers will not work with the crossmember in a Mustang II. You will need to use Hooker or Hedmann headers. I bought my Hedmanns for around $150 from Summit. I am surprised to see that the pipe interferes with the steering column; I've never seen that before. It makes me wonder if your exhaust manifolds are not stock. The manifolds were specific to the V8 Mustang II.
    #11
  12. Laslo

    Laslo New Member

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    Naw, those are probably not from any stang.
    More likely they are from a galaxy or something like that, not sure actually :)
    Do you have any part numbers on the headers you got, i would appreciate it.
    :nice:
    #12
  13. Laslo

    Laslo New Member

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    Well, I got my thumb out and browsed around on SummitRacing a little.
    Are these the headers in question:

    Hedman

    Hooker
    #13
  14. itsaMustangtoo

    itsaMustangtoo New Member

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  15. welder4956

    welder4956 Member

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    The stock exhaust had an extension on the left side with a flat spot for clearance where it passed by the steering column. Here's a detail of the extension piece, but the flat spot is not visible here:

    Attached Files:

    #15
  16. dmann253

    dmann253 New Member

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    I have a 2.3 in my 77 and i was also thinking of putting a late model mustang drive train in mine but after serious thought ive decided to go witha Hi performance turbo charged 4 cyl just so i can say that i beat my brothers 05 gt with a 4 cyl=P besides gas is outrageous in a v8
    #16
  17. Feldspar

    Feldspar New Member

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    Yeah, I did the V-8 swap in my 74 last year and i had the original manifolds on and there was NO issue at all with the steering. My recamendation on headers would be the hookers.
    #17
  18. Laslo

    Laslo New Member

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    Argh, more headache.
    Well, this is what i have on currently, does it make any sense?

    V = Drivers Side H = Passenger Side

    LasloEnginemounts.jpg
    #18
  19. jeffnoel

    jeffnoel Founding Member

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    Those are definitely the wrong mounts.
    #19
  20. Wart

    Wart I'm Mad as HELL and I'M not Gonna Take it ANYMORE! Founding Member

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    Can you get any kind of number off these mounts?

    This will help in figuring out what they came from, they sure aren't like any factory II mount I've seen.
    #20

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