the one i removed seems to be about .035 (crushed)and the only ones in the shop are for a gen V and they seem to be about .055 (uncrushed). the old one is orange in color and has GM stamped into it so im figuring its a factory head gasket. this came from a crate mercury engine and i would have thought a marine head gasket would have been used, but then again it may actually be. question is, how do i tell? i called my local napa and they can get me a factory style gasket, but it doesnt say the thickness in thier books/computer. im hoping since i ordered an 89 mark4 head gasket that it will show up being the correct thickness since i am only changing one side. what should the uncrushed gasket measure?