i bought two camshafts at a local swapmeet the guy said they were Z28 camshafts hyd. i put one in my truck and it sounds and runs great but now i have mixed up the other one in my garage and cant i.d it does anyone know how to find out which one is a Z28 cam the one i think it is has a red band and yello band and a diamond symbol is this the right cam. it has no other markings.

 

approximately what year do you think it is?
Z28 covered a LOT of years and different setups.