Permatex High-Temp Read RTV Silicone Gasket is formulated for hi-temp applications.  Replaces almost any cut gasket by making reliable "formed-in-place" gaskets that resist cracking, shrinking and migrating caused by thermal cycling.  Coat pre-cut gaskets to increase reliability.  Temperature range -65 degrees Fahrenheit to 650 degrees Fahrenheit intermittent.  Resists auto and shop fluids.  First generation gasket maker.  Fills gaps to .25" when fully cured.  MIL-A-46106 B