I have a cc6k lobe in my 383sbc. Can't say anything bad about it but I bought it in '97. Could be worse now. Now that I think about it this probably doesn't help at all.
One thing I can add is that the advertised rpm range is right on in my motor. Track1 heads, 1.6 rocker arms and it is done by about 6800.
I RUN HIS ROLLER BLOWER CAM IN MY SMALL BLOCKS , WORK GREAT , NOT MADE IN HOUSE BUT FROM A COMPANY IN CALIFORNIA ..BUT NEVER THE LESS , NEVER A PROBLEM,,,,PAUL