I would leave the eziout on the shelf. I have never had much luck with anything except breaking them.

I would drill and tap. When a steel bolt is bonded in the aluminum like that a lot of times it will bring the threads with it when it comes out anyway.....so then you will have to helicoil it or similar.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.