Quote Originally Posted by 406Rich View Post
Can we check by using a mark 4 head gasket compared to block and head, or is it just that close you can`t see the differance...?
yes i can tell what i look at many way even if the heads are on but the 5and 6 bocks have a open decks all but the CNC bow tie i own all the bow ties at one time and had some mark 6 bocks as built many of the 4.5.6 block s