Do not O ring your heads... trust me on this. If you are going to blow a head gasket, its happening for a reason. With a solid tune you should not have any head gasket issues. O ringing the heads can lead to catastrophic failure of the much more expensive bottom end pieces if the headgaskets are not allowed to fail... if they don't something else will. Let the head gasket be a fuse, its much cheaper to replace than a set of rods, pistons, etc.
