He and Atom'x of the Uncanny Amazers died in the battle fighting Mordru.
Blast Off was later discovered to live on as a gestalt energy form and joined the Legion as Drake Borroughs aka Wildfire.
I've spent some time on this BG and the fire fx. It was difficult to find reference for this character. Nevertheless I always enjoy bringing to life classic characters from long ago and doing my contemporary take on it.
Incidentally, I often go comics shopping to Blastoff, that's the name of a really good comic book store in North Hollywood. Here is the link to the store's Facebook page: https://www.facebook.com/pages/Blastoff-Comics/225861877482304
Anyhow, have a great weekend.