Head gsks mostly fail due to the stress created by the differnt expanction and contraction rates of the heads compared to the engine blocks. If you are re-usingthe gskon the same head and block location any imperfections that may have been impressed into the gsk will just match up with the head and block.What I'm up againt is that I think I put the head gasket on the dowles and then put the oiler and o ring in and then the heads and torqued them and the manual says the oiler 1st then gasket and so on. I didn't realise it until after.