Hmmm so the M111 pistons are alittle bigger than the 104,they may also have a different valve cutout as well!.

The B series rods you mentioned earlier with the same BE dimentions,are they also available in a 149mm length?

I have two spare sets of custom JE pistons made for the M111 kompressor sitting on my desk they just need machining with spacers to suit the rods used.(but would need a new block if i wanted to use them).

Back on track with the breath topic,based on what BMW has achieved the C36 should make much more power and the head looks to be where its at,and if i ever swap out my 4 i think the 3.6 with headers,intake plenum,cams,manual trans and new ECU would be where i'd take it...no turbo!!