To help kick off the new TR/OBR billet crankcase we will be upgrading every piston port engine or long block to a billet case at no charge. No codes or anything special you need to do on your end while ordering. This includes engines on sale, not on sale, prostock's and full mod's. Excludes the G320/340, twin and 46cc engines. G320RC and G340RC full mod engines can be upgraded at an additional cost. All reed engines are billet case.