Alum to steel? Well, if GM says it, it can be done. I think he is volunteering... I'd bet the alum would fracture at the braze though.
Heb Dduw, heb ddim; Duw a digon
I'm that gun-totin', farm-raised, evangelical, pro-environment, OHV ridin'/drivin', Southern civil rights pro-labor Liberal yo' momma told you couldn't possibly exist.