Today i had the oppurtunity to check visually 3 different excentric a-b and c shafts. To me there was no mods comparing the a-b shafts to c shaft. I weighed the shafts to.
A=10300 grams (stock)
B= Lightened around the 3 rotor lobes 10100grams
C= 10350 grams (stock)
To me there must be some kind of modification in the big intermidiate housing. Hope to check this out in the future!