New technologies for older models are exclusively made from Reliance, and are available for the full range of the John Deere engine part 400 Series. Hypereutectic refers to aluminum pistons with a silica content exceeding 12 percent. The result is a piston with superior wear resistance, less thermal expansion and increased thermal barrier properties. Our John Deere engine part series includes a compression enhancement for improved starting. All Hyper-Formance overhaul kits are backed with a 3 year, 5000 hour warranty. Endurance Power Products maintains a large inventory allowing immediate processing and delivery of each John Deere engine part, reducing your downtime.