sixstar

ok, will the the block(just the housings and rotors and such) from a 86-88 fit into a 89-91 rx7, using all the components(intake/exaust, and so on) from the 89-91 onto the 86-88 block? without changing ecu's and motor mounts and such, if so will it be worse than the 89-91 block?

FC3S_nataku

iTrader: (3)

well the block will fit but i know that the s4 houseing spark plug holes are differnt than s5. dont think this will matter but just food for thought

Wicked_razor

u gotta change the front cover or do something with the oil metering pump

C-Murder

are you swapping an S4 block into an S5, or S5 stuff onto an S4 block?
aka, is the ECU S4 or s5?

Parastie

Got to http://www.rotaryresurrection.com/ and click on tech. You'll find your answers there.

westler91

You are actually doing an a$$ backwards swap......

C-Murder

nevermind what I wrote; I'm off in la la land. S4 block = poo compared to S5 block because of the difference in compression ratios. It is possible though....but try and stay with an S5 block

sixstar

ok, im sticking with a s5 block, does anyone know where i can buy one cheap?

Parastie

No, the S5 blocks are getting harder to find. Might try a local junkyard or the for sale section.