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  87 HO 302 in a 77 Mustang II

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Author Topic:   87 HO 302 in a 77 Mustang II
erl
Journeyman

Posts: 8
From: Albuquerque, New Mexico U.S.A.
Registered: Aug 2004

posted 08-27-2004 08:55 PM     Click Here to See the Profile for erl   Click Here to Email erl     Edit/Delete Message   Reply w/Quote

Hello, Thinking about getting an 87 HO 302 and putting it in a 77 Mustang II that had a stock 302 V8 before and still has the C4 auto in it. What would I need to do to hook it up? Is the 87 fuel injected? Would I need to get a whole new wiring harness? or can I convert the 87 302 to a carburated version? Can I use the old 77 intake and carb on the 87 motor or would there also be linkage problems? Also the exaust manifolds. Can this be done without too much hassle? I don't want to open a can of worms. Any advise would be appreciated. Thanks, erl

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Percy Hazel
Journeyman

Posts: 58
From: Bellingham, WA, USA
Registered: Jul 2000

posted 08-29-2004 02:01 AM     Click Here to See the Profile for Percy Hazel   Click Here to Email Percy Hazel     Edit/Delete Message   Reply w/Quote
You will need to rebalance the C4 flywheel to the 50oz spec.
The 87 is fuel injected but I'm not sure which "Speed Density" or "Mass Air".
On the intake its your choice go fuel injected whith the 87 stuff or go with the older carb system.
No...the 87 exhaust will not work you will have to use the old stuff.
Good luck

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perce111
78T-Top...IAM TOO

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erl
Journeyman

Posts: 8
From: Albuquerque, New Mexico U.S.A.
Registered: Aug 2004

posted 08-29-2004 02:56 PM     Click Here to See the Profile for erl   Click Here to Email erl     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Percy Hazel:
You will need to rebalance the C4 flywheel to the 50oz spec.
The 87 is fuel injected but I'm not sure which "Speed Density" or "Mass Air".
On the intake its your choice go fuel injected whith the 87 stuff or go with the older carb system.
No...the 87 exhaust will not work you will have to use the old stuff.
Good luck



Ok, This is what I have gone and done. I have a 74 Fastback (thanks Percy and everyone for helping me solve my overheating problems with the V6) Well I bought a 77 Mustang II on eBay and found out that the motor was exchanged with an 87 . After much wrangling with the owner he told me he had put the motor in it and had exchanged the intake and exaust manifolds and that it is pretty much bolted up. Well this is a 77 Mustang II with a primo Black Cobra interior and all the V8 parts, cross members, radiator, tranny etc. the outside body is rusted but I don't need the body. Though it does have some nice T-tops and King Cobra rims. It has all the parts that I need to covert my cherry 74 to V8 or Cobra / Mach 1 status. So I was double checking to see if he was perhaps decieving me. So far everything looks good, and on the up and up. I just have to go to Indiana and pick it up. I guess my next questions are: Being that the 74 only came with smaller motors and the hardware for such, Does anyone know if I am going to encounter any problems putting all the 77 parts into my 74? Will I have to fabricate any new holes for brackets and mounts since they never existed for a V8 on a 74? I guess I should have asked these important questions before I went and bought the 77 Mustang II. Any further help would be appreciated. And thanks everyone for the help already. I love this forum!

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Percy Hazel
Journeyman

Posts: 58
From: Bellingham, WA, USA
Registered: Jul 2000

posted 08-30-2004 01:53 AM     Click Here to See the Profile for Percy Hazel   Click Here to Email Percy Hazel     Edit/Delete Message   Reply w/Quote
Should be similar to the V8 instl we did in a 74 Pinto wagon.
The biggest headache {I think} will be the lack of space up front..rad-fan.
When you look at the 77 you will see the difference. We used a special water pump [not available anymore] made by Snowflake motor parte in CA. I believe that Ford now offers a short pump, 1.5/2.0 shorter than normal. We didnt have to chop up the front end rad supports using the short pump [relocating radiator forward].
We than used twin pusher electric fans.
When you get both cars together you will see the problem and you may even be able to work out a different solution.

Happy trails

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perce111
78T-Top...IAM TOO

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erl
Journeyman

Posts: 8
From: Albuquerque, New Mexico U.S.A.
Registered: Aug 2004

posted 08-30-2004 08:13 AM     Click Here to See the Profile for erl   Click Here to Email erl     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Percy Hazel:
Should be similar to the V8 instl we did in a 74 Pinto wagon.
The biggest headache {I think} will be the lack of space up front..rad-fan.
When you look at the 77 you will see the difference. We used a special water pump [not available anymore] made by Snowflake motor parte in CA. I believe that Ford now offers a short pump, 1.5/2.0 shorter than normal. We didnt have to chop up the front end rad supports using the short pump [relocating radiator forward].
We than used twin pusher electric fans.
When you get both cars together you will see the problem and you may even be able to work out a different solution.

Happy trails


Hmmm, You would think that being the same body style the 74 would be the same as a 77 under the hood. The length of the engine compartment is shorter then? Is it the fire wall or the radiator support that makes it shorter? I do work in a body shop so I might be able to use the 77 radiator support, or modify the existing one. Geeze how did they fit air conditioning in there too? Maybe this is the can of worms I don't want to open as the V6 runs better now. Thanks

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UnbridledFury
Gearhead

Posts: 1488
From: Tacoma, WA
Registered: Jun 99

posted 08-30-2004 02:54 PM     Click Here to See the Profile for UnbridledFury   Click Here to Email UnbridledFury     Edit/Delete Message   Reply w/Quote
The 1975 Mustang II was redesigned at the front end to allow the V8 to be installed. The radiator support was redesigned, and the fender, hood and header panel was also changed.

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Motor Safe!

George
1975 Mustang II
1994 Ranger XLT 4X4 (200,000+ miles)
2000 Windstar
Unbridled Fury
My web server

M&M Member #47

US Army, Retired

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erl
Journeyman

Posts: 8
From: Albuquerque, New Mexico U.S.A.
Registered: Aug 2004

posted 08-31-2004 12:13 AM     Click Here to See the Profile for erl   Click Here to Email erl     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by UnbridledFury:
The 1975 Mustang II was redesigned at the front end to allow the V8 to be installed. The radiator support was redesigned, and the fender, hood and header panel was also changed.



Can I use any of the parts to up grade my 74? Not that it needs a whole lot of upgrading. It definitely needs the cheezy avocado interior changed. The Cobra interior parts should fit? My 74 is the loaded version with front and rear sway bars. Rather than modify the engine and compartment can I still use the C4 automatic tranny, rear end and other mechanical parts? Will it bolt up to my V6? perhaps with a different bell housing etc.? Thanks erl

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UnbridledFury
Gearhead

Posts: 1488
From: Tacoma, WA
Registered: Jun 99

posted 08-31-2004 12:22 AM     Click Here to See the Profile for UnbridledFury   Click Here to Email UnbridledFury     Edit/Delete Message   Reply w/Quote
Most of the interior should go in quite nicely. The dash will be a bit different. The 74 and early 75 (like mine) has the wiper switch on the dash. The late 75-78 has the wiper switch on the turn signal arm. But if the dash panel (where the instrument panel is) in your 74 looks OK, then the rest of the dash will go in OK. I replaced the dash assembly in mine with a 76 after mine got busted up after a military Hummer decided to go 4 wheeling over my car.

------------------
Motor Safe!

George
1975 Mustang II
1994 Ranger XLT 4X4 (200,000+ miles)
2000 Windstar
Unbridled Fury
My web server

M&M Member #47

US Army, Retired

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