I bought a new head gasket for my 98 blazer from rock auto. It is an ACDelco with a part number 12552362. I received it today. Along one edge of the head gasket it says MARINE MARINE MARINE MARINE. Is this a head gasket for a 4.3 marine application? Is there a difference? Do they all say this? Is it made of a different material? Is it made to be more tolerant to lake/sea water as apposed to antifreeze coolant? Most importantly... can I use it, or should I return it and get a different one? Thanks.