https://gopro.com/v/dMenDvOnpeOoR
heres a newer s63 block with the factory notches at the bottom of the cylinder wall
https://gopro.com/v/Lv8L14L2gOnkX
heres the difference between the 2011 x6m's original angled/curved s63 rods and the newer F10 M5 rods (Arrow 2000hp rods)