I need some help i did a mini me swap a6 block z6 head. As i was driving my car died. I then noticed when cranking the car by hand using the crankshaft that it spun the cam gear but not the camshaft. The key in the gear that connects to the shaft broke off.
I need to know if b2 gear fits z6 camshaft. Also have some damage on the camshaft, is this bad and camt be used?

 

Those are some clean valve springs.