6311 - Full Mod G320RC Top End (Replacement for engine 6300) We do all of the

We do all of the same porting as our full mods as well as additional piston modifications

The PROSTOCK engines produce more power than the race ports and are more economical

have more mid range power and rev higher

To start we machine the cylinder for the 2mm stroker and for a proper squish clearance with out stacking gaskets

Between the new reed case and 40mm bore cylinder were seeing a massive increase in torque and mid range power compared to a 32cc

6311 - Full Mod G320RC Top End (Replacement for engine 6300) We do all of thePorting not shown in picture! Full mod G320RC top end. Can be installed onto a stock G320RC engine or is a replacement top end for full mod engine 6300. View engine description for modifications done to top end. https: oneillbrothers. com products 6300 7 7hp full mod zenoah g320rc 31 8cc engine?_pos=1&_sid=6be5a34a3&_ss=r Top end comes complete with: Ported cylinder Modified piston piston ring Cylinder gasket Transfer port skavenging covers Wrist pin