These plate are made to order, please allow 3-5 business days for production. They are CNC machined out of 1.25″ thick steel and has M12x1.75 tapped thru hole. The taper on the back allow clearance for the tooling to fit without any interference.
If you are having problem with valve sealing when the head are torqued down, you may benefit a lot from using a head torque plate when doing valve seat.
These plate will ship to Canada and the United State for free!