The question is if I can run s5 irons on a stock s4 block without modification?

Simple question but I want to understand why or why you can't use them. My thinking is that the s5 irons are slightly thicker and reduce the chances of cracking so I'd like to use them on my build. However, I know that the s5 has a different harness therefore I want to retain the s4 housings and front plate. I also understand that the s5 rotors have a higher compression rate than the s4 rotors but I have 5 sets of s4 rotors so that's what I'll be using.

To recap:

S4 wiring harness
S4 injectors
S4 rotors
S4 housings
S4 front plate
S5 irons (all three)
Can this be done without modification?

 

Is mixing engine irons between s4 and s5 okay? I've done research and am 90% sure that the irons are interchangable but the housings aren't (unless in japan and australia if I remember right). Is this right?

 

you're good to go.

 

yes... front cover couldnt think of the name for it at the time ha. Thanks for the answer btw.