{"product_id":"je-pistons-ring-sets-1-2-1-2-2-5-subaru-ej257-block-w-ej20-head","title":"JE Pistons JG4904-3937 Piston Ring Set 1.2\/1.2\/2.5 Subaru EJ257","description":"\u003cdiv style=\"background:#f7f7f7;border-left:4px solid #c00000;padding:14px 18px;margin:0 0 18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;font-size:1.1em;\"\u003eAbout JE Pistons\u003c\/h3\u003e\n\u003cp style=\"margin:0;font-size:0.95em;line-height:1.55;\"\u003eJE Pistons engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full JE Pistons lineup with fast shipping and expert fitment support — order with confidence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin:24px 0 8px;\"\u003eWatch in action\u003c\/h3\u003e\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:0 0 18px;border-radius:6px;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/-lmrtLfWU0M\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen loading=\"lazy\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003ch2\u003eJE Pistons JG4904-3937 Piston Ring Set: Subaru EJ257 Performance Upgrade\u003c\/h2\u003e\n\u003cp\u003eMaximize the performance of your Subaru EJ257 engine with the JE Pistons JG4904-3937 Piston Ring Set. This specialized set features a 1.2mm, 1.2mm, and 2.5mm ring configuration, specifically designed to optimize sealing for EJ257 blocks when used with an EJ20 head, ensuring maximum horsepower and engine reliability.\u003c\/p\u003e\n\n\u003ch3\u003eEngineered for Subaru Performance\u003c\/h3\u003e\n\u003cp\u003eJE Pistons is a leader in high-performance engine components, and this ring set is no exception. The JG4904-3937 set is engineered to:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProvide superior sealing for the Subaru EJ257 block\/EJ20 head combination\u003c\/li\u003e\n  \u003cli\u003eEnhance horsepower through efficient combustion pressure retention\u003c\/li\u003e\n  \u003cli\u003eReduce internal friction for smoother operation\u003c\/li\u003e\n  \u003cli\u003eIncrease engine durability under demanding conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRace-Proven Technology for Your Build\u003c\/h3\u003e\n\u003cp\u003eBenefit from the cutting-edge technology trusted by top racing professionals. JE Pistons offers custom services like back cutting, dyke cutting, lapping, grinding, and PVD coating. These race-proven enhancements, utilized by NHRA Pro Stock and NASCAR teams, deliver significant gains in power, reduced friction, and improved ring seal, making them perfect for high-performance Subaru builds.\u003c\/p\u003e\n\n\u003cp\u003eElevate your Subaru's performance with the JE Pistons JG4904-3937 Piston Ring Set. Find this and other premium engine parts at GGCRACING.\u003c\/p\u003e\n\u003cdiv style=\"margin:24px 0;border-top:1px solid #eee;padding-top:18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;\"\u003eOften bought with\u003c\/h3\u003e\n\u003cp style=\"font-size:0.9em;color:#555;margin:0 0 8px;\"\u003eOther popular JE Pistons products customers consider together:\u003c\/p\u003e\n\u003cul style=\"padding-left:20px;margin:0;\"\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/je-pistonspiston-ring-set-4-060\" style=\"color:#0066cc;text-decoration:none;\"\u003eJE Pistons Race Series Piston Ring Set 4.060 Bore — File Fit Plasma Moly\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/je-pistonswrist-pin-52-series-1-990-2-930-180-161-gram-1\" style=\"color:#0066cc;text-decoration:none;\"\u003eJE Pistons 52 Series Wrist Pin .990 x 2.930 — High-Strength Steel\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/je-pistons-suzuki-drz-400-inv-dome-piston-kit\" style=\"color:#0066cc;text-decoration:none;\"\u003eJE Pistons DRZ-400 INV Dome Piston Kit — Fits 2000-2016 Suzuki DR-Z400, 2003-2006 Kawasaki\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/je-pistons-vw-2-8liter-vr6-kit-set-of-6-pistons\" style=\"color:#0066cc;text-decoration:none;\"\u003eJE Pistons VW 2.8L VR6 Forged Piston Kit — Fits 1992-1999 VW Corrado Golf Jetta Passat\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/je-pistons-vw-2-8liter-vr6-kit-set-of-6-pistons-1\" style=\"color:#0066cc;text-decoration:none;\"\u003eJE Pistons VW 2.8L VR6 Forged Piston Kit — Fits 1992-1999 VW Corrado Golf Jetta Passat\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"JE Pistons JG4904-3937 Piston Ring Set 1.2\/1.2\/2.5 Subaru EJ257\",\"description\":\"Boost your Subaru EJ257 with JE Pistons JG4904-3937 Piston Ring Set. Precision 1.2\/1.2\/2.5 rings for max power \u0026 seal. Shop GGCRACING!\",\"brand\":{\"@type\":\"Brand\",\"name\":\"JE Pistons\"},\"mpn\":\"JG4904-3937\",\"url\":\"https:\/\/ggcracing.com\/products\/je-pistons-ring-sets-1-2-1-2-2-5-subaru-ej257-block-w-ej20-head\",\"offers\":{\"@type\":\"Offer\",\"price\":\"173.99\",\"priceCurrency\":\"USD\",\"availability\":\"https:\/\/schema.org\/InStock\",\"url\":\"https:\/\/ggcracing.com\/products\/je-pistons-ring-sets-1-2-1-2-2-5-subaru-ej257-block-w-ej20-head\",\"sku\":\"JEPJG4904-3937\"}}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/ggcracing.com\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Parts \u0026 Accessories\",\"item\":\"https:\/\/ggcracing.com\/collections\/parts-\u0026-accessories\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"JE Pistons\",\"item\":\"https:\/\/ggcracing.com\/collections\/vendors?q=JE+Pistons\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"JE Pistons JG4904-3937 Piston Ring Set 1.2\/1.2\/2.5 Subaru EJ257\",\"item\":\"https:\/\/ggcracing.com\/products\/je-pistons-ring-sets-1-2-1-2-2-5-subaru-ej257-block-w-ej20-head\"}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does the JE Pistons JG4904-3937 Piston Ring Set 1.2\/1.2\/2.5 Subaru EJ257 fit my vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Compatibility depends on your exact year, make, and model. Contact our experts at GGCRACING with your VIN and we'll verify before you order.\"}},{\"@type\":\"Question\",\"name\":\"How long is shipping for JE Pistons?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.\"}},{\"@type\":\"Question\",\"name\":\"How do I install the JE Pistons JG4904-3937 Piston Ring Set 1.2\/1.2\/2.5 Subaru EJ257?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most installs are bolt-on with basic hand tools. See manufacturer documentation for torque specs and procedures.\"}}]}\u003c\/script\u003e","brand":"JE Pistons","offers":[{"title":"Default Title","offer_id":41454448934996,"sku":"JEPJG4904-3937","price":173.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/3210\/2484\/files\/7eaaeb5909b36a54a9c15aabae9fc5a1_b10e1b4d-f946-4131-9b56-d048953af728.jpg?v=1721663895","url":"https:\/\/ggcracing.com\/en-co\/products\/je-pistons-ring-sets-1-2-1-2-2-5-subaru-ej257-block-w-ej20-head","provider":"GGCRACING INC","version":"1.0","type":"link"}