This is a discussion on "Meth injection and thermal gasket?" within the Car Specific forums. This forum, and the thread "Meth injection and thermal gasket? "are both part of the Engine Specific category;
In a short answer, No. There is to much airflow on top of the heat that keeps that from happening. Unless you soaked the gasket in methanol for days on end it's not going to harm anything.
Most plastics are very resistant to methanol except ABS plastic.