I am replacing a head gasket on a 1979 Yamaha DT250. I can't figure out which way is up on the head gasket. One side of the copperhead gasket is indented up and the other side just reversed. The old gasket is completely flat because I assume when you torque it down it smashes the indentation flat. I just don't wether it makes a difference which side the indentation should be on?? Thanks