JE Pistons JG4904-3937 Piston Ring Set 1.2/1.2/2.5 Subaru EJ257

SKU: JEPJG4904-3937
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About JE Pistons

JE 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.

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JE Pistons JG4904-3937 Piston Ring Set: Subaru EJ257 Performance Upgrade

Maximize 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.

Engineered for Subaru Performance

JE Pistons is a leader in high-performance engine components, and this ring set is no exception. The JG4904-3937 set is engineered to:

  • Provide superior sealing for the Subaru EJ257 block/EJ20 head combination
  • Enhance horsepower through efficient combustion pressure retention
  • Reduce internal friction for smoother operation
  • Increase engine durability under demanding conditions

Race-Proven Technology for Your Build

Benefit 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.

Elevate your Subaru's performance with the JE Pistons JG4904-3937 Piston Ring Set. Find this and other premium engine parts at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About JE Pistons

JE 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.

Watch in action

JE Pistons JG4904-3937 Piston Ring Set: Subaru EJ257 Performance Upgrade

Maximize 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.

Engineered for Subaru Performance

JE Pistons is a leader in high-performance engine components, and this ring set is no exception. The JG4904-3937 set is engineered to:

  • Provide superior sealing for the Subaru EJ257 block/EJ20 head combination
  • Enhance horsepower through efficient combustion pressure retention
  • Reduce internal friction for smoother operation
  • Increase engine durability under demanding conditions

Race-Proven Technology for Your Build

Benefit 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.

Elevate your Subaru's performance with the JE Pistons JG4904-3937 Piston Ring Set. Find this and other premium engine parts at GGCRACING.

Product Details

Product Description

About JE Pistons

JE 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.

Watch in action

JE Pistons JG4904-3937 Piston Ring Set: Subaru EJ257 Performance Upgrade

Maximize 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.

Engineered for Subaru Performance

JE Pistons is a leader in high-performance engine components, and this ring set is no exception. The JG4904-3937 set is engineered to:

  • Provide superior sealing for the Subaru EJ257 block/EJ20 head combination
  • Enhance horsepower through efficient combustion pressure retention
  • Reduce internal friction for smoother operation
  • Increase engine durability under demanding conditions

Race-Proven Technology for Your Build

Benefit 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.

Elevate your Subaru's performance with the JE Pistons JG4904-3937 Piston Ring Set. Find this and other premium engine parts at GGCRACING.

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