Can you TIG the cups to the head somehow? could you get enough penetration between the alluminium and unobtanium to fuse them together? then get the head "decked" until the welds are flush with the rest of the head?
precups can't fall out unless they melt o crack to pieces, and if they melt or crack to pieces, welding them won't help either
I have a BOC welding book somewhere from the 1950's and I'm sure it says you can weld inconel to ally I'll have to dig that one out eh
what did the destruction inside the engine look like? i'm curious to hear from people who have experienced this
It happened to an engine in a car that was in my driveway, the car was run hard daily over a long steep pass, 3 miles of %10 grade, this pass ruins cars for a living.