GM Gen V LT1 Head FlangeThis head flange is for the Generation V Chevrolet LT1, LT4, L83, and L8B engines. 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