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The JE Pistons forged piston kit for Subaru EJ257 Block with EJ20 Head gives your performance engine build a strong foundation for demanding street, track, and racing use. Manufactured in the USA from 2618 aluminum, these pistons combine durable forged construction with JE's application-specific engineering and decades of motorsport experience. The Forged Side Relief (FSR) design uses a reduced skirt width and shorter wrist pin to help lower friction and reciprocating weight. In-house forging and precision machining produce the crown geometry and piston dimensions needed for a dedicated performance short block. Supplied as a set of four with piston rings, this kit brings proven materials and purposeful design to your next engine build.
| Specification | Details |
|---|---|
| Brand | JE Pistons |
| Manufacturer Part Number | 325249 |
| Series | JE Pistons |
| Engine Application | Subaru EJ257 Block with EJ20 Head |
| Cylinder Head | EJ20 |
| Bore Diameter | 99.52 mm |
| Compression Ratio | 9.5:1 |
| Compression Height | 1.209 in. |
| Piston Material | Forged 2618 Aluminum |
| Piston Quantity | 4 |
| Forging Type | FSR (Forged Side Relief) |
| Piston Head Type | Dish |
| Piston Volume | -16.40 cc |
| Average Piston Weight | 411 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 | 2.250 in. |
| Wrist Pin Wall Thickness | 0.180 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 | 0.165 in. |
| Intake Valve Relief Diameter | 1.550 in. |
| Exhaust Valve Relief Depth | 0.165 in. |
| Exhaust Valve Relief Diameter | 1.550 in. |
| Intake Valve Relief Angle | 20° |
| Exhaust Valve Relief Angle | 20° |
| Accumulator Groove | Yes |
| Precision Pin Fit | Yes |
| Skirt Coating | Yes |
| Manufacturing Location | USA |
