Sealed Power E-1025KC Engine Piston Ring Set

Sealed Power E-1025KC Piston Ring Set

Sealed Power E-1025KC is a standard-size engine piston ring set built for 99.50 mm bore applications with a 1.2 x 1.2 x 2.0 mm ring groove width profile. It uses a steel top ring with chrome face, a cast iron second ring, and a 3-piece flex vent oil ring for precise sealing in Subaru performance and street engines.

Fits 2013-2016 Subaru WRX STI, N/A; Fits 2004-2014 Subaru Impreza, N/A; Fits 2013-2014 Subaru WRX, N/A; Fits 2004-2013 Subaru Forester, N/A; Fits 2005-2012 Subaru Legacy, N/A; Fits 2005-2009 Subaru Outback, N/A; Fits 2004-2006 Subaru Baja, N/A.

• Part number: E-1025KC
• Outside diameter and bore size: 99.50 mm
• Standard-size ring set for 4-cylinder engines
• Top ring face design: barrel face
• Second ring face design: reverse torsional
• Top ring material: steel with chrome
• Second ring material: cast iron
• Oil ring design: 3-piece flex vent
• Oil ring tension: low
• Ring groove widths: 1.2 mm x 1.2 mm x 2.0 mm

This piston ring set is used during engine rebuilds and top-end service where cylinder sealing, oil control, and compression retention need to be restored. It is a direct-fit choice for Subaru WRX STI, WRX, Impreza, Forester, Legacy, Outback, and Baja applications listed above, and the E-1025KC part number is commonly searched for these 99.50 mm bore Subaru engines.

• Restores compression loss caused by worn or stuck rings
• Helps reduce oil consumption from worn oil control rings
• Addresses blow-by and crankcase pressure buildup
• Supports smoother combustion after engine overhaul
• Helps correct uneven sealing in high-mileage cylinders

Installation should be performed during a proper engine rebuild with cylinder bore measurements verified before assembly. Confirm the 99.50 mm bore diameter, standard size specification, and 1.2 x 1.2 x 2.0 mm groove widths before ordering. Ring end gaps must be checked and set to the engine builder’s specifications during installation.

Sealed Power uses modern materials and ISO- and QS-certified manufacturing processes to produce engine components for demanding applications. This part cross-references 2C5219 and 12033AB340 for the same application.

Quality assurance is supported by Sealed Power’s manufacturing standards and material selection for engine service parts. Part number E-1025KC is built to meet the requirements of compatible Subaru 99.50 mm bore engines listed in the fitment data.

Compatible Subaru Fitment

• Fits 2013-2016 Subaru WRX STI, N/A
• Fits 2004-2014 Subaru Impreza, N/A
• Fits 2013-2014 Subaru WRX, N/A
• Fits 2004-2013 Subaru Forester, N/A
• Fits 2005-2012 Subaru Legacy, N/A
• Fits 2005-2009 Subaru Outback, N/A
• Fits 2004-2006 Subaru Baja, N/A