Accu Seal Pro Header Gaskets for 1987-97 Ford 460 wedge with EFI. The EFI 460 has two exhaust port configurations depending on use, heavy duty applications (such as motor homes & Super Duty trucks) use a larger modified rectangle as seen in SCE p/n 4135. Other applications have a smaller squared port as seen in SCE p/n 4235. This gasket set includes both designs since it is very difficult to determine the port shape until the manifold is removed. Material: Metal Reinforced, Graphite Impregnated Fiber; Thickness: .062″; Package Contents: 2 Pair.