I agree, from a side view, the OHV tanks are kind of flat on the bottom, the flathead tanks have a bit of a curve, more rounded shape, and it does look nice. Indeed, I've googled for flathead re-pop tanks and have never got a hit or lead. Was hoping someone here knew something that google didn't. 110 miles sounds like enough range to always find a gas station, but riding South of Spokane, on the out of the way roads and highways, it's not too difficult to rack up 100 miles between gas stops. Many of the little towns don't have a station, or have co-op type pumps where you have to be a grange member or something to get gas.
True, the standard oil capacity seems to be enough...but on a hot day I'm thinking that too much oil can't be a bad thing, and even a few degrees less temp splashing on the cylinder walls might not be a bad thing. On the other hand, on a cool or cold day maybe too much of a good thing. Perhaps more worthwhile if you have piston oilers/squirters, high capacity/flow pumps and modifications and all that. My engine is quite stock.
Well thanks...if anyone has a set of stock ULH tanks in the garage, and would let them go for $100, PM me.