The one Herbert roller I ever measured wasnt even close to the advertised specs.
None of it was correct....... Not the Lift, duration, or lsa. All were off enough to where it was hard to believe the cam had the correct part number on it.
Of course, nothing else in their catalog matched my measurements any better.

I seem to recall Chip had a similar experience with his Herbert roller.

As Andy mentioned, put a degree wheel on it and measure it up.
It is what it is, regardless of what the specs say it's supposed to be.

I did find this with a little digging: