[P.J.]

The machine for milling the block can be a bridge port or a horizontal milling machine. The tool that leaves the machineing marks on the block is a carbide fly cutter. that is a tool about 8 inches or larger in dia which serated to accept carbide inserts
that can be replaced as they dull. The carbide tips can be secured in the tool with a set screw. Then when the tool gets to the end of the scribed line the machine travell is then cross
fed to avoid the vin stamp.
hope that helps
suprss70