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The JE Pistons forged piston kit for Subaru EJ257 STI gives your engine build the strength and precision of a dedicated performance piston package. Manufactured in the USA from 2618 aluminum, these pistons are designed for the heat and cylinder pressure of demanding street, track, and racing applications. JE combines decades of motorsport experience with in-house forging and precision machining to create application-specific crown geometry and consistent piston dimensions. Durable forged construction makes this kit a strong foundation for a performance short block, while the included piston rings bring the package together. Whether you are rebuilding an engine or planning a more ambitious performance project, this set of four delivers quality materials and proven engineering.
| Specification | Details |
|---|---|
| Brand | JE Pistons |
| Manufacturer Part Number | 256058 |
| Series | JE Pistons |
| Engine Application | Subaru EJ257 STI |
| Cylinder Head | EJ257 STI |
| Bore Diameter | 100.00 mm |
| Compression Ratio | 8.5:1 |
| Compression Height | 1.209 in. |
| Piston Material | Forged 2618 Aluminum |
| Piston Quantity | 4 |
| Forging Type | Round |
| Piston Head Type | Dish |
| Piston Volume | -22.20 cc |
| Average Piston Weight | 403 g |
| Piston Ring Set Included | Yes |
| Top Compression Ring Thickness | 0.0480 in. |
| Second Compression Ring Thickness | 0.0480 in. |
| Oil Ring Thickness | 0.0995 in. |
| Top Ring Groove Width | 0.04800 in. |
| Second Ring Groove Width | 0.04800 in. |
| Oil Ring Groove Width | 0.09950 in. |
| Wrist Pin Outer Diameter | 0.905 in. |
| Wrist Pin Length | 2.500 in. |
| Wrist Pin Wall Thickness | 0.150 in. |
| Connecting Rod Length | 5.137 in. |
| Engine Stroke | 3.110 in. |
| Wrist Pin Material | 5115 Low Carbon Steel, Case Hardened |
| Intake Valve Relief Depth | 0.200 in. |
| Intake Valve Relief Diameter | 1.250 in. |
| Exhaust Valve Relief Depth | 0.200 in. |
| Exhaust Valve Relief Diameter | 1.250 in. |
| Intake Valve Relief Angle | 20° |
| Exhaust Valve Relief Angle | 20° |
| Accumulator Groove | Yes |
| Precision Pin Fit | Yes |
| Skirt Coating | Yes |
| Double Pin Oilers | Yes |
| Manufacturing Location | USA |
