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Discussion Starter #1
HELP. Can anyone help me with something im going to do. I have a 65 mustang coupe with a 6-cyl. 3-speed trans. I also have a 1970 model 390, and i want to join the two together and have a unusual fe pony.I know that in 67 the 390 would fit but not sure about the differences in the engine bay.If there is anyone that can help me with any suggestions i would greatly appreciate it. I only gave $400.00 for this mustang so i can afford to spend a little on it.pic is attached.
 

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There are too many issues you have to deal with, when swapping any V8 into an original 6 banger car. All suspension has to be replaced, all brakes, the rear end has to go to a five bolt, new drive shaft...just about the entire undercarriage. Since the suspension and drivetrain would never see a lot of HP and torque, they were built with much lower grade materials. You would also have to do a front clip, to remove the shock towers, to fit the new exhaust system.

Ron
 

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ibjhb said:
Was the 1967 that would take a 390 originally a V6 or a V8?
this car would have normally taken the 289. again, there were some things ford did in order for that engine to fit, but it can be done.

like the guy said above, there are too many issues to deal with when swapping a 6 to an 8. you're better off buying a pony with an 8 already installed.
 

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The car will have to be altered regardless the motor it came with. The 390 is a lot heavier motor. It will not make a good handling car because it is extremely front end heavy. At speed you turn the wheel and you go straight- not good. The 390 requires that the fender liners be cut because the engine bay is too narrow but it will fit. You will also have to drill the liners to change the plugs. You could leave them off but it eliminates driving in the rain. I did help a bud do this mod to his 'stang years ago. It was not satisfactory and I don't suggest it. While a 390 in a small car sounds like a fast car- it ain't. The 390 is a truck engine. First came out in a truck tractor. It makes lots of torque at low rpm but it ain't no screamer. The motor has the limits of a 3 degree twist on thge rods which means you are not going to turn it very fast. It is and was designed to be a slow turning engine with lots of torque. And that is exactly what it is. I suggest that you would be happier with a 289/302/351 in you car and the mod would be by far cheaper.
Flash
 

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Didn't the 68 stang come with a 390 or 396. My borther had one when I was little, it was shot when he got it and took it out. But is had the 396 I think.
 

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I can assure you that Ford never made a 396. Chevy has the SS396, and Ford did have the 400M, but no 396 I have ever seen. There are some excellent books on the market that will take you thru all the years and chronologies on the motors.

Ron
 

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Yep, they put a 390 in the 68. Friend had one. His was the GTA model. Even though it was a larger car it still was a bad handling car. They put a 429 in the 69 which is a larger frame rail and it is better but still not good at handling. Just too much weight up front- no balance. I would like to have a 69 , 429 Boss, one of these days but right now I got too many rods and not enough sleighs.
Flash
 

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Anything is possible...This has been my latest project going into year 5 now. 514 Ford Motorsport in a 1968 Mustang FB. Started with a $1500.00 wreck, and everything has now been replaced, newly installed or custom made and fitted in. As far as handling...all I need is a straight 1/4 mile.



Ron
 

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ro514 said:
Anything is possible...This has been my latest project going into year 5 now. 514 Ford Motorsport in a 1968 Mustang FB. Started with a $1500.00 wreck, and everything has now been replaced, newly installed or custom made and fitted in. As far as handling...all I need is a straight 1/4 mile.

Ron
Would that engine fit into a 1966 Mustang Coupe? I've got a 289 V8 in there now. How much was the total for all that, if I may ask?

Thanks.
 

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Sure, you could make that fit. You would need to do a front clip, so that you could remove the shock towers to make room. Its the cost of what has to be done to the rest of the car to handle the power that gets real pricy. The subframe, the tubbing, the roll cage to tie it all together, the shortened rear end, the 31 or 35 spline axles with the 9 inch, the transmission, the custom cooling system, the remote oiling system, the modified pan, the front springs, the wiring, the gauges,the interior mods, the fuel system to keep it running, the brakes to slow it down, it needs a 6 inch cowl hood to clear the carb....It might be cheaper to build a tubular chassis, go all fiberglass.
The 514 (after some mods) makes 685 HP at 6250 and 610 ft/lbs of torque at 4250.

The engine is a Ford Motorsport crate motor, to which you still have to ad an oil pan, pump and pickup, starter, waterpump, carb and wiring. That alone ads up to about 11K.

Question is what would you like to do and how much HP are you looking for?

Ron
 
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Discussion Starter #14
I did not see it answered above very clearly so I will add what I can. 65-66 never came with anything above a 289. 67-68 came with 390s and 428 (427,428,429 cant remember). The 67-68 cars were much bigger in the engine bay. 390s fit in those, but with next to no room to do ANYTHING. In regards to a 6 to 8 swap, most people will tell you that it is just not worth it due to the amount of stuff you have to change out, ALL suspension and brake parts, bell housing, (chuck the 3 speed manual if you have it), rear end.

Now your deal.

Major cutting on the front end will have to be done to fit that motor in there. I don't know the specifics, but it will be a lot of work that needs to be done by someone who really knows what they are doing (that may be you, I don't know)

Suspention will need to be found from somewhere, all VERY heavy duty stuff. I don't know of compatibility issues with later stronger stuff and the 65-66 parts that were never designed for bigblock use.

5 lug 4 wheel disk breaks will be needed.

9inch rear end/hvy duty rear springs shocks

must use either 4 speed toploader or c6 auto. The 3 speed man and the c4 are just not strong enough

Subframe connectors and a bunch of other frame support type modifications. Full roll cage would definately help. Again, this year was not designed for the weight and power of a big block.

The end result is that it would be MUCH cheaper to pick up a 67-68 v8 car and start from there on your project, but if you are willing to spend enough time and money ANYTHING IS POSSIBLE. But you may end up spending $25,000 on a car that will never be worth more than $4000. The fact that it is a 6 coded car and has then been cut and modified to the level that you are doing will be a harder resell than even an intact 6 cyl car. Just know where this will head in the long run.

:D
 

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Engine Swap

:) First thing to think about beyond the usual uniqueness is the weight in the front will require some serious suspension component changes to a V8 suspension (ball Joints, springs etc). As a Performance Shop Owner I would suggest a better upgrade that will give you performance, easy acess to newer repair parts, and a better reliability. Go to a wrecking yard that has Mustangs from 89-94. purchase a donor vehicle and rip out the engine, trans, and rear axle. Plus the entire computer system. Convert your Stang to a Fuel Injected Pony with all the parts from the donor vehicle. You will end up with the same base power plus a little more than the 390 with a real loss of weight in the front end.
Fomocodoc
 
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Discussion Starter #16
351 stroker engine

A 351w will fit in 65-66 and you can stroke it out to 427cu in.
 

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you all act like your scared of a 390. I can't believe it.engine, mounts, heavier springs, and an aluminum intake. cutting torch an a welder is all you need now. hard to handle! Crap, give me a muscle car that ain't hard to handle and i'll give it back to g.m. and maybe they remember the s-10's with 350's and the rest of their trash that they decided to "do a little work on'" does a ford guy have less ambition? :fly: :fly: :edit: :edit: :fly: :fly: :fly:
 

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ibjhb said:
I'm not sure about your car, but I was told I could drop a 351 in my 66 Mustang. Not sure if that's any help...

Take it to a Ford/Mustang shop and have them look at it.

Also, your attachment didn't show....

I have a 351w in my 66......
 

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What are yousurfing old posts?..


cripes with the number of posts you have made, one would think you know better....last post on this topic was 2 bloody years ago.

You think maybe they learnt all they could at the time??

Wake up to your self man!!

oh..yer only commenting becuase this the is th 4th dead topic youhave repopend that i have seen....and only just logged on!
 
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