I have recorded exhaust port temperatures on some engines during dyno runs that approach 2K degrees F. during a hard pull. I can't imagine any type of sealer that will survive those kinds of temperatures!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!