SEAT SPUD
For machining custom valve seats, in addition to the expansion arbor, I have a simple aluminum spud and lock. I can quick machine it down for whatever seat I need. It started out as a 1-foot-long piece of round stock, and I just keep drilling and tapping as I face it for next oddball seat sizes. Because you’re facing it after mounting, you can just machine the OD and not have to re touch the bottom of the seat when you make an adjustment. Often, I’ll machine for intake and exhaust seats in a step on the spud.

Ron Flood
Cedar Machine
North Branch, MN
DECEMBER, 2021