This head flange is for the 1.8L Mazda Miata.
These high quality made in the USA flanges are 1/2″ thick made from 1018 steel. They feature full 3D CNC porting ensuring a smooth transition from the port shape to the runner piping without the need for porting/crushing the piping. The face of the flange features a 0.1″ recess to help concentrically locate the runners, perfect for 1-1/2″ SCH10 manifolds. Flanges priced each.