WHAT DOES 13B REW FOR SALE MEAN?

Our S2000 motors are rebuilt from leading to base with new Piston rings, major & rod bearings. Head is machined & block is honed prior to shipment.REAL promise. Any complications just let's know and we will get it sorted rapid, we have the group below to aid.Been given the engine four days after the predicted supply day. The engine is in very good