BMW R1200RT/R1250RT Forum

During a recent Valve check on my 2011 Twin Cam I noticed that when removing the Nearside Valve Cover a Rubber "Block" had become dislodged and dropped to the ground. Checking the opposite side Cylinder I could verify the position where the "displaced" block should fit and this was duly replaced.
My query is. does anyone know just what the intended purpose of this component is.
In the Parts Fiche this component is call "Twist Protection Left and Twist Protection Right. Part Numbers 05 11 12 7 710 489 / 490.
Thanks.

Found the same question on BMWMOA, Twist protection? Rubber blocks in cylinder head (bmwmoa.org) no answers!

The Haynes manual describes them as support blocks. They fit beneath the lower cam follower pivot points. Perhaps there is some potential for the casting to twist during valve operation. Having said that, the upper pivot points look the same and are not supported. I wonder if the direction of rotation of the cam chain has anything to do with it.