Hey Luis,
If I'm not mistaken, Sissels offers an epoxied lump head as well as a brazed one. You have to go into their Adobe Acrobat price list to find the listing. You got my curiosity up now, I'm gonna go back and look myself.
I've been using epoxies for cylinder an case mods for years on racing two stroke engines.
Can't say that it'd last forever but I've never seen a failure personally. No experience with an L6 head though . . . . YET !
'Crockett
