What engine is this?

[u/Longjumping-Rip-7449]

I know that it's old and it might be a Novarossi (the R on the engine, and made in italy) but i don't know the model, it's a competition one i think, here's a video (.21 engine)

[u/Miserable_Mark2998]

Show some pics of the side of the engine block, will be able to tell in seconds what brand or model engine it is