Making a counterbore and mounting intake valve seats on jig-mill

In this video i show you how you can make a counterbore on a jig-mill. I have made a fixture to mount my cilinderhead so i can easely adjust the cutting angle and repeat it for the other valve seats.
I am using a digital agle comparator to verify the angles.
I am placing new valve seats because there was a crack in the original cast iron seats. See my other videos "metal stitching". Thank you for watching and pleace subscribe to my chanel. So Oldt