Was there any performance diffrence in the vn series 2 and the vr v6 tappets? i know they look alittle diffrent but not sure if the vr ones would be better or not?
Real cars don't power the front wheels, they lift them
Long answer is yes, short answer is no. You will not see any performance improvement by fitting VR rockers to your VN.
Try and find some used roller rockers online instead.