hey guys i need some help i got a rb engine in a trade i just did but im not sure what rb engine it is i was told it is a RB concepts .21 3+1 port CE engine can you guys give me any feeback on it is this a good engine ? its got about 1 gallon on it so ive been told feels like its got good compression anywho here are some pics can you guys help a fellow racer out thanks alot.