MrScary

I'm just wondering the difference between the 5.0 in the Mustang and the one in the Grand Marquis. And what would be involved in making it the same?

 

amo4387622

The 5.0 HO which is in a mustang is different from what i can remember is that the firing order is different, the cam is more aggressive than the regular 5.0, the computer is more performance tuned, the cylinder heads are a lot more free flowing than the restriced cylinders heads they put on regular 5.0's, and they use bigger fuel injectors, also instead of regular exhaust manifolds they use tubular manifolds. If i remember anything else or find out more i will let you know.

MrScary

So all I really would have to do is swap most of the top end and the ECU?

amo4387622

Yes pretty much replacing most of the top end parts is all you need to do. but to make it easyer you can pull the old 5.0 and drop in the 5.0 HO. I also remembered that the throttle body is bigger along with the egr plate. but if you try to put the mustang TB on the regular 5.0 you have to moddife it to fit the stock linkages up to it. and if the car has crusie control and you replace the ecu you lose it even if the mustang ecu had cruise control.