I agree with you on the Ultras.Mine were on for 5 year with 12.5 440.Pulled the headers from my kids 318 truck and reused them.I guess I must walk on water.That and Ive been doing it longer than most here have been alive.The ones on my iron heads from the 440 are still on them.The header side looks like new.Almost reused them on the aluminum heads.Might leave them on when we put those heads on the 413.Rocky