Here is the situation: I picked up a FD block from a local shop that they no longer wanted. I am going to pull it apart and check all the clearences, then overhaul it. I noticed that the front rotor housing has the R stamped on the top. Does it really matter what order they go in? The only difference I can see is the Knock sensor should go in the front rotor housings. Would there be a problem if you just had the rotor housings swapped? I am just curious and it makes me question the quality of this shops work. Thanks

 

they are different. the air injection passages are mirror imaged, so thats the difference

mike

 

Mirror imaged? Can you explain a little more, you lost me.