Overhauled Continental Aircraft Engine Cylinder pn 653452. Steel .010 Oversized. We found these in an inventory we recently purchased. This is a bare cylinder, and does not include valves or rocker arms. It does come with an Authorized Release Certificate Approval Tag from Australia dated on December 15, 1999. This cylinder looks to be in great shape. We believe that this cylinder will fit on Continental Engine GTSIO-520.