Get the os cvrx .18, its a direct fit and has a ton of power. the big blocks will take some work to get going not to mention you will need a new clutch bell, clutch and other parts to get it going, redrilling of the chassis. its possible. my buddy rc danny on the redcat forum did it to his volcano and put a hyper 21 8 port in it, its crazy fast and wheelies on demand.