GT350son

What has to be done when putting a stock 1987 5.0 ho efi engine with aod into a 1984 gt350 that currently has a 5.0 CFI with aod?

86 5.0L

take all the parts connected to the '87 engine and put them in the '84

GT350son

would the timing of the non high output through off the computer thats for the ho?

86 5.0L

well, alsong as you keep the HO ECU with the HO engine youll be fine

GT350son

okay. well i'm asking because I found a 87 efi engine. so i can drop it in my car to have efi for better mpg. it has aod and is complete engine, but needs rebuilt. So i wouldn't be able to put the efi on the 84 unless i changed the cam and firing order?

GT350son

and would i need a higher pressure fuel pump?

mjr46

84-85 cfi mustangs all carried the h.o designation enven though they were flat tappet equipped and firing orders should be the same as an 86 and up you can use an 87 long block in your car no prob with cfi, although cfi is not the most desirable for performance, if using the long block and your cfi fuel injection no changes need be made, however if you wish to use the 87 fuel injection then you'll need wiring harness and a SD ecm but even that has it's limitations, if it were me I'd use a 89-91 harness and mass air set up

Portmaster

^^^^ What he said, lol

redpony88

really? cause i would have thought it'd be better not to mention alot easier to go with a carb. since it s a 84 model. correct me if i'm wrong though

GT350son

if its a complete engine i should be able to just put it in right? comes with upper and lower intake, harness, injectors, computer