As with all Tecnopower engines it is GRP based. Most internals are from the same production of GRP but new made and based on new specs/timings Rody has determed. The crankcase should be new production but if you look closer it seems an old one grinded/milled down to a very small and light looking crankcase.
The head is new and it is smaller. Most onroad engines are 50mm, this one is 45mm saving a lot of weight compared with some holes, te funni thing is that it is not lowered as Rody has develloped with the RB engines and it copied by many other brands.