Well it work if put and S5 N/A motor its just the motor, and using S4 stuff like manifold and ecu those stuff in an S4 N/A..

 

http://rotaryresurrection.com/2ndgen...o_s4_swap.html

 

I'm not sure if absolutely everything bolts up to the same locations - but if you're using an s5 "keg", and absolutely everything else is s4 (intake manifolds, vacuum routing, engine harness, especially the oil metering pump and probably the front stack and cover, too to get the gear to drive the pump) then it should be good to go.

You can't use the s5 OMP without some way to rig it up, because it's electric versus shaft driven, but if you use the s4 front stack for the gear to drive the OMP and the s5 counterweight to balance the different weight rotors, you should be fine. Definitely read through that writeup on the RotaryResurrection site to be sure there's not something I missed, because he does that kinda stuff all day long.

 

alright..i was wondering about just using and S5 longblock and everything else S4 because one of the apex seal on my front rotor went bad and was only running on one rotor. i just want a longblock to change it now for me to drive and probably will last till next year where i can do a turbo swap. i only have around $600 to spend but i could probably put more in.