Opinions On Head Gaskets

The 5 star review user had commented about using Hylomar against the block side of the shim. There's a trick Tom Nelson does to make his high boost turbo engines seal on the street with copper gaskets and steel wire O rings that involves a pair of heat guns and Permatex aviation gasket maker that would probably work with an iron to iron copper sandwich. But I'd play it safe with the steel shim and copper coat spray myself being that it's available.