Sorry Ron
I meant to write billet and obviously wrote cast doh

is a billet alloy thrust washer going to be ok ? or would it be better to be stainless thrust washer then tig welded to a cup.
surely the cup can simply be cast alloy or thin stainless as its only being used to divert exhaust gases. water pressure there would not be much would it ?

and 6061 T6 is old hat in Europe nowdays, we use the 6082 T6 , Pretty much the same but a bit tougher. dont know what polishes up best though ?