Sticky: I6 to V8 conversion

Danielavina93

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Oct 30, 2012
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So Durden I do have an 8 inch rear then correct? And my radiator is a 3 row. And the disks in front drums on back will be more than enough to the new v8 right? And will. Have to change out the drive shaft? Or cut it? I was told I mite have to cut it an inch or two to fit the t5?
 
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Rusty67

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Dec 3, 2002
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I think I should have been more clear. I meant a fox body donor car. He already has v8 suspension as I understand it. You get a fox setup being a roller cam 5.o and a T5 with everything you need. Change the motor mounts and add the adaptor for the zbar linkage or convert to a cable clutch. Change the drive shaft and the trans cross member and away you go. Might need to change the radiator or have the water neck moved. Get an 87-90 for a block with factory forged pistons and a WC T5.
 

Rusty67

15 Year Member
Dec 3, 2002
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Also, if you have an 8" rear don't even bother to change it, it will be fine unless you start puting down well over 300hp. Or if you start really hot roding it and dropping the clutch at 3000 rpm all the time you might break it but as long as you are not going nuts on it all the time it will be fine. Besides, as much as I hate to say it, an 8.8 is a WAY better upgrade then a 9" for ANY 302/5.0 motor.
 
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Danielavina93

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Oct 30, 2012
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That's the rear end obviously. And so the drive shaft will need to be changing? But the 302 isn't going to be mildly modded. At the most ill have headers and gt40 heads. Thinking about what carb I should use. Are there specific throttle linkages for certain carbs or are they all the same? I want to make sure and have all the parts I need for this motor swap so that's why there's a lot of questions. Sorry
 

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Rob Morton

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Dec 12, 2014
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Thanks guys for putting this up! I am giving this a lot of thought at the moment. I'm doing a rolling restoration on my recently imported '66 6cyl and slowly parts collecting for a V8 swap. It would have been many, many years before I could have afforded a usable early V8 fastback car over here in England, (not many for sale anyhow!) and I get to drive this one to work everyday. Suitable secound hand Engines/boxes aren't too bad to find over here but un-narrowed rear axles seem to be! New small parts also seem pretty cheap to import from the states. In time I will be replacing all the parts that will need to be upgraded/swapped out anyway. I hope (maybe naively) to have the car off the road for a short time as possible, and do as many of the upgrades/swap outs in manageable chunks before the big one. The brakes/hubs/uprated suspension/steering/wheels area is one that I plan to do first, but seems to be a very big chunk that is all connected, All help/suggestions welcomed!
 

D Durden

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Mar 9, 2000
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So Durden I do have an 8 inch rear then correct? And my radiator is a 3 row. And the disks in front drums on back will be more than enough to the new v8 right? And will. Have to change out the drive shaft? Or cut it? I was told I mite have to cut it an inch or two to fit the t5?
Man, sorry this took so long to get back to you.

The front discs and rear drums aren't bad. ProMotorsports Engineering actually has some drum setups that are pretty amazing (for drums). They supposedly have a "zero fade" system. Dunno . . . but it sounds good.

I'd ditch the radiator for a BeCool unit or something like that. The little '65/'66 radiators are small at best. Get something aluminum and crossflow just to be safe.

I had to modify my driveshaft with the 8", so that may be the case with your setup, too. I did with my 8" BUT I think it also fit my 9" Versey when I went with it.

Picking a good master cylinder / brake booster is a bear, too. I know a lot of guys are going with big master cylinders and no brake booster and say it works pretty well . . . stiff, but well. I'm considering it.
 

tom68bullit

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Jan 3, 2019
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SOUTH HARROW HA29NN LONDON
I bought a Mustang 6 pot 20 years ago, since then i have sourced all the parts (new/second hand) and transformed it into a 289cui v8, 4 speed top loader, and a 9" Locker axle.69/70 front axle with discs and servo, drums on the rear.Bodywork has arches widened to accept 8"x15" Wolferace Ally Wheels on the front and 10"x 15" on the rear.It has been lowered and stiffened suspension.All steering changed, now with Power steering as well.Interior now has 69/70 High backed seats Re- upholstered in Black. Was resprayed 10 years ago, and is now Porche Guardsman's Red.All work carried out by myself (accept the Body work/spraying)
 

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CRAM

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Mar 23, 2020
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Williamsville NY
First post... Working on a 1970 coupe My son-in-law just bought It. It has all the necessary things a V8 car needs as stated in the previous posts. BUT the VIN #s are for a six Cyl. car. It has been registered for years as a 6 Cyl. Is this a possibility?. The only thing is the car has drums all the way around. Thanks for any thoughts on this.
 
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