Some people at Car shows

Took my Demon out for a drive today and stopped at the newstand to get that Hemmings Muscle Car mag that has the article about Hemi Denny and 62BT409's EL5 Demon in it and a guy asked me if my car had a 3/4 or full cam in it? What the hell does that mean? Is that a Chevy term or what?
I should have told him it didn't have any cam at all.