How to determining what cam is in a motor

Hey all,
How can I determine what cam is installed in a motor w/o tearing it apart?
Thanks
TAZZ

Put your ear to the tailpipe and start it. While it is running, you can faintly hear a soft voice telling you the lift and duration of the cam. Don't rev it, or the whisper will turn into shouting....


No, the only way to tell is to degree it.