I notice while changing my head gaskets on my V-12 Lincoln, the new gaskets had totally different water jacket openings. The new gaskets did not match the water jacket opens on the heads or block. The old gaskets were copper and the new ones were composite material. I searched all over and from my observations, i noticed that "all" the new gaskets were the same. Has anyone noticed this? I believe that this is the partial cause of overheating on the V-12. Maybe I should contact the gasket makers and get them on-board.