From 4 to 8 swap in a fox

**buickbear** · 09-09-2009, 06:17 AM

What parts are needed to swap a 4cy fox over to a v8? Crossmember, radi?

**73FordDriver** · 09-09-2009, 07:43 AM

5.0? or 5.8?

**buickbear** · 09-09-2009, 08:54 AM

5.0 carb from 4 fuel injected

**Bullitt331** · 09-09-2009, 02:24 PM

The K-member is the same. Bigger radiator, front suspension, rear suspension (i.e differential and springs, shocks ect) brakes just to name a few.

**buickbear** · 09-09-2009, 04:03 PM

how hard is it to change the brakes over? or is there a better up grade. What about crossmember?

**Bullitt331** · 09-10-2009, 03:50 PM

Maybe the transmission crossmember has to be changed. It may also be the same for the V-8. The K-member the engine bolts to is the same for either the 4 cyl or V-8. If you are uncertian about the trans crossmember, just use one out of a 5.0 Mustang.

**Bluemr24** · 09-13-2009, 09:14 AM

A 5.0 donor car would be ideal, but since you're going carburetor, you don't need all the electronics, etc. Still, the fuel tank must come down, change the pump, lines, etc., all the exhaust system, and front spindles from a 5.0 car would help braking.
Some guys choose to keep the 4 cyl. springs up front, but the 7.5 rear has to go too. Cant think of much else, but this is a lot easier than going EFI.
MikeR

**Forged331** · 09-13-2009, 08:16 PM

EEC Performance Here is a good guide.

Changing a Fox Mustang from a Four Cylinder to a V-8 - 5.0 Mustang and Super Fords Magazine Another guide.

1979 to 1993 Ford Mustang 4 Cylinder v8 Swap Mustang Engine Swap Conversion And here you can buy a guide.

Hope this helps. My 92 is a 4cyl conversion and you would never guess. The 4 bangers are better imo because the chassis hasn't been abused...you can also build it up the way you want it as you go along.

-Steve

**cauldron** · 10-25-2009, 08:45 PM

New motor-mounts
Trans cross member is the same
Bigger radiator
Trans cooler
trans cooler lines
Tach needs changed from 4 to 8 setting
front springs and struts
total exhaust system
ignition box (set MSD to 8) duraspark works
some accessories like power steering and alternator will work in either
Different pulleys on accessories
Bigger battery
new heater hoses
bigger electric fan, or flex fan, or bigger fan with fan clutch

PARTS TO MAKE A 5.0 RUN A CARB

Intake manifold
carb
lots of vacuum line
accelerator cable (and bracket on intake)
kickdown linkage
Timing indicator (sometimes it's the same)
new fuel line from tank
new front cover with port for mechanical pump
fuel pump cam
and pin
and spacer for pin
new front seal
new oil pan gasket ('cause it has to come off for the front cover)
air filter that fits under the hood when it's shut