The time-honored setup that still works well is using brass nuts with a longer thread than a steel nut, and a dab of Never-Seez to keep the thread from seizing up due to exhaust heat. Those nuts can be snugged periodically as the gasket material compresses.
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!