I just got a cam give to me and the guy couldnt remember what size it was. It came out of his 396 and he thought it didnt come into power until about 3800 rpm. What I want to know is can anybody tell me what it is by this four didgit number on it or will I have to have it measured or how ever it is they check. The number is 1091, this is the only thing stamped on it. Thanx