We're proud to announce that we are now CNC porting all of our engines. The TR/OBR billet piston port crankcase upgrade on all engines went over so well we've decided to do it permanently. From now on every engine will come with a TR/OBR billet crankcase as well as being CNC ported. CNC porting and hand finishing is all done in-house by the OBR staff. We do not contract out any of our porting so every engine is modified to our exact specifications. We are able to offer higher accuracy this way as well as more power. Our CNC machine has allowed us to take our porting to the next level due to us being able to do cylinder work that is not possible to do by hand. OBR will be engraved in all 36mm cylinders.