Aluminum Bits? i think your fever is higher then mine.
Do u think the aluminum 6061 ring would see temps in excess of 450 degrees since it is shielded from exhaust gasess (I do not want the weight of a stainless ring)? I do agree with u on the screws. Do u think a stainless locking washer with Ultra copper on the screws would keep them tight? I could always counterbore the top holes and use a bolt and nut but it adds to machining.
Thanks for you input!
Mark