die. Preferably. :) Metal cores are overkill, rubber spacers weren't very useful to me. Glue to the valve cover with a thin layer of RTV and leave to harden for 10-15 minutes, coat the other side (motor side) with a thin layer of axle grease, place carefully on the cleaned head surface and tighten the screws. down to "just a touch plus another 1/4-1/2 turn" and they last for YEARS with no leaks - I opened up a valve cover set with these gaskets after 12 years and they were still reusable and kept leaking - free Gasket, I've never had to replace these particular gaskets. Since I lightly oiled the side facing the engine, they are easy to remove and reinstall.
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