The SE 255's are called a smog cam because they pass EPA and come stock in the CVO models, they are not much more then a stock cam, the intake duration is only 211 and the intake valve closes at 25 I think, very early so it makes torque early but will fall of after 4,000 rpm, plus the a overlap of only 13 will make more heat. I put in the SE 204,s, in my opinion a much better cam and pulls past 5,000 rpm, I tried different cams and like the SE 204's the best, if you are deciding between the 255 or 222 I would choose the 222, it is a very close cam compared to the SE 204.
4th Bat, 37th Armor, 1st Inf Div, Desert Storm vet
Member of Son's of Confederate Veterans MC Company A, 2nd Battalion, Virginia
2015 Ultra Classic
99 FLHT, S&S 97 inch BB, Andrews 37G cams, Daytona TT ignition, Vance & Hines PP, Branch Heads