Not in any current models, it isn't.
It is in a 75, and possibly in a 164, but was a bit of a waste of time in the 155 and 156. The less said about the 166, the better.
The only modern Alfa V6s worth having are the GTAs.
But they're not cheap.
The jury is out on the 159, 'cos it's the new Alfa / GM V6.