[Zedder]

Dave, you are absolutely correct, but they never left circular marks like on Bob's block. They are always parallel to the crank and varied in depth (some almost non-existant to the naked eye) depending on how sharp the broaching tool was. Some one (I think John Hinkley) wrote and article on the process for the NCRS driveline I believe.

Maybe it was sanded in some way to leave that pattern, but in NCRS-type judging it would not pass inspection.