Problems with Best brand head gaskets.

Run distilled water and water wetter as a lubricant and rust prevention.. that’s all. Water transfers heat better than anti freeze as this traps heat hence the name. Never ever had an issue with overheating or rust formation
 
I have never had problems with either make "big bore" composite gaskets. I always had perfectly flat decks and heads. Torqued and heat cycled a minimum of 3 times. Aluminum heads torqued cold, cast iron heads torqued hot. New studs at build.
 
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