Hi all. The cam in my motor (uprated Kent 711 block) has 701M 6250 AA cast on it. I have read the only cam that can be legally used for FF has the markings 771M 6250 BA. I have also read that the 70 on my cam and the 77 on the listed cam are the year of manufacture. Is there a difference between the two cams as far as lift and duration goes? Does anybody know what the AA and BA stand for? Thanks for any help I can get.