Mario Rossi left LM and went to Picco for his mills. The XR line made by LM will be discontinued and will be replaced by these Picco made mills. The reason why? Don't know. One speculation i read on the onroad forum which imo is viable: Mario Rossi wanted a race proven platform for his onroad engines which can take the abuse of onroad racing. Picco can deliver that platform.
Run times are amazing.. I can do a 30 minute main with 2 stops pretty easily if we're paying attention. Sleeve doesn't wear easily so it's an engine that you want to preheat before starting whether it's summer or not or you'll wear your connector rod out on crankshaft side pretty easily but the rods are relatively cheap. Power band smoothness is awesome and break in was easy too. I love the fact that I finally run an engine that doesn't change tune on me for no reason and when coming into the pit hot the tune is single stage no problem all day long. I won't be changing anytime soon.