It's possible although they did not hit, and there was absolutely no signs in the pushrods that they had rubbed anything. I do not blame the rockers, the real reason may be whatever; too little spring pressure or something else. Anyway, that's what happened and it always went in to the shaft side..., making the rocker ratio interesting. No such problems with any other rockers with the same set up. In our B1's TD's single shaft solved all the valvetrain problems.