A CVO engine is NOT what many people assume, which would be an engine full of those parts in the Screamin' Eagle catalog. What it really is, is a regular production engine that has a slightly larger displacement due to a larger bore, different but still street legal cams, and different but not true SE heads. It's something anyone with a couple grand can do to a stock TC96/103 with pistons, jugs, heads, and cams.
Btw, it is the largest displacement regular production engine Harley sells. The 120R is not a street legal regular production engine (hint: the R stands for Racing, not Street Legal).
Something else a CVO isn't is a "custom". Custom implies one or very few copies, not the thousands of identical bikes Harley now sells as CVO's. A modern day CVO is just a high end option package, no different than when you spring for the Limited Titanium package at the auto dealership. The "custom" tag is just typical marketing hype.
Jerry