This barrel is not an alloy, it is metalcoated, an I've never seen an other one like this.
Oh I think about to cast alloy barrels, the mould and the cast was not the problem. How to fit the camfollowers? Like those from the A65?
It's to much work, and it does't pay,or it has been a batch of 15-20 barrels.
The current engine is an optimised SR Motor with single carb. Everything is lightend, converting to single valvesprings, alloy pushrods,
camfollowers reduce to 41 gramms, Cam is a reground 357. I gues the best is, it will shown by pictures. Gearbox is 5speed Nova, but I think about an six speed TTI the same as to the Goldy.
The frame is an B31 and the bike is 139kg, Ceriani frontfork and a Robinson double twin leading frontbrake.
I think the bike scratch 120 miles with an excelent handling. At some racetraks I am faster as with the Goldy.
I build up a new racer, with an A10 OIF, twin carbs, with 73mm bore, steelconrods, Megacycle cam and so on.
Most of them is ready to fit, still hope I find some horses more.
I found actionpictures at facebock, hope it runs. I am not the PC expert
https://www.facebook.com/205915476111232/photos/pb.205915476111232.-2207520000.1435701732./727543613948413/?type=3&theaterhttps://www.facebook.com/205915476111232/photos/pb.205915476111232.-2207520000.1435701906./715926781776763/?type=3&theater