Complete engine (block and head)made out of cast aluminum. Does anyone know what the life span of one of these engines is?

Fatlu

the testing on the first prototypes have over 140k and have been altuna tested and are running strong
since gm is offering a 100k warranty that tells me they have a lot of confidence in this set up

I guess I'm just an old timer. Wasn't one of the last GM vehicles offering an entire aluminum engine the Chevy Vega?