As the title says. I was on E-bay and noticed that the head gasket for a G63B is the same as a 4G63. Now is it possible to put this kind of head on this engine fairly easy? I'm not really planning to do this any time soon, but I thought it would be cool to check it out. And what about a timing belt, would the 4G63 timing belt fit, or would you have to have a special belt?