2.4S vs. 2.2S MFI -- DIFFERENCES?

What are the differences between the 2.2S and 2.4S MFI systems? Pumps and stacks only? Thanks.

All S throttle bodies have the same port size on 69'-73' MFI cars, that is they are 38mm where they meet the stack and 36mm where they meet the intake port on the head.

However, the stud spacing differs where the stack meets the throttle bodies. The 2.2 mag stacks and the 2.4/2.7/3.0 plastic stacks all have the same spacing. The 69' 2.0 stacks have a unique stud spacing compared to the above stacks.

So basically, only 2.0 stacks only go with 2.0 TB's. 2.2/2.4/2.7/3.0 stacks can mix and match with 2.2/2.4/2.7/3.0 TB's.

The injector lines and injectors are identical.

All throttle bodies T, E and S have a bore of 38mm where they meet their appropriate stack. They differ only in that the side that meets the head matches that appropriate port. i.e. 36mm for S, 32mm for E and 29mm for T MFI motors.

So what this means is that any T or E throttle body can be bored out to 36mm where it meets the head port and be used for an S setup with the appropriate stack.

One more difference between the 2.2 and 2.4 MFI motors is the cold start enrichment setup. The 2.2 motors had the fuel sprayed in from a fitting in the metal air box above the mag stack. On 2.4 motors the fuel sprays from the fitting in the side of the plastic stack. 2.4 motors also had plastic air boxes.

The 2.4 throttle bodies also had a nipple for a vaccuum line that was used for the vaccuum retard distribututors.