Cosworth forged pistons are engineered and manufactured in the UK using the same processes developed for their Formula 1 engines. Features include xylan anti-scuff skirt coatings, ultra-strong pins, polished domes, and anti-detonation bands. Each application uses a unique forging to minimize weight and ensure the strongest possible piston. Subaru applications use a proprietary Cosworth alloy similar to 4032, a high silicon alloy with a low expansion rate and high wear resistance making it ideal for extreme street performance as well as dedicated track applications. Piston kits are priced with rings. Replacement ring sets are also available separately.
Usually ships the next business day (99.5mm Pistons Backordered Until End of June)
| Part No. | Description | Bore Size | Price Ea. | Add to Cart |
|---|---|---|---|---|
| 10001430 | Cosworth Piston & Ring Set 79mm Stroke 8.2:1CR (EJ257) | 99.5mm | $848.00 |  |
| 10001431 | Cosworth Piston & Ring Set 79mm Stroke 8.2:1CR (EJ257) | 99.75mm | $848.00 | |
| Part No. | Description | Bore Size | Price Ea. | Add to Cart |
|---|---|---|---|---|
| RCH-1515 | Piston Ring Set For Cosworth Piston Kit | 99.5mm | $99.00 | |
| RCH-1516 | Piston Ring Set For Cosworth Piston Kit | 99.75mm | $99.00 | |
| RCH-1517 | Piston Ring Set For Cosworth Piston Kit | 100.0mm | $99.00 | |
| PP5433 | Spare 23mm Piston Pin Circlip for Cosworth Piston | Subaru | $7.00 | |
| RS-CWP-TOOL | RalliSpec Cosworth Circlip Installation Tool | Subaru | $225.00 | |
