My question is the title, also is it possible to put an f4i motor on this frame? how hard is it if its possible

another question would be, is it as simple as taking the carburator out and replacing it with a throttle body from an f4i...i mean obviously i know its not simple but u guys know what i mean lol

 

the moters will mount up just fine but they are different + the wiring, gas tank, ecm and a lot of the relays /sensors are very different. not worth it in my book.

 

+1 to CJardine. While installing an F4i engine to the F4 frame is certainly possible, its not as simple as just the engine swap itself. If you were starting w/a completely stripped F4 frame, you could build it up as an F4i but as mentioned, you'd need all the F4i accoutrements.