JE Pistons Ring Sets 1.2 / 1.2 / 2.5 Subaru EJ257 Block w/EJ20 Head

SKU: JEPJG4904-3937

Piston Rings

JE Piston Rings

JE Pistons

JE Pistons Ring Sets 1.2 / 1.2 / 2.5 Subaru EJ257 Block w/EJ20 Head

SKU: JEPJG4904-3937

Piston Rings

JE Piston Rings

LOW STOCK! Est Ship 3-5 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.

We accept

Description

JE Piston Rings are designed to maximize horsepower through precision sealing of combustion pressure. They are offered in a huge selection of sizes, various materials, and in multiple thicknesses to suit a wide variety of engines. JE Pistons also offers an array of custom piston ring services including back cutting, dyke cutting, lapping, grinding, and PVD coating. These services, the same used by top NHRA Pro Stock and NASCAR teams, are now available to the public and offer tremendous gains in durability, power through reduced friction, and improved ring seal.

Part Type

Engine Piston Ring Set

Data: v4.2 - Upd: 2026-09-29 05:57:57

Features

combined with standard or low tension oil rings
Highest quality ductile iron top ring with plasma-moly inlay
Taper faced reverse torsional second rings

Specifications

Product Attributes - UPC: 00193564241924
Product Attributes - Brand: JE Pistons
Product Attributes - Notes: This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications.
Product Attributes - Gapless: No
Product Attributes - File Fit: Yes
Product Attributes - Quantity: Sold as a set of 4.
Product Attributes - Bore (mm): 100.000mm
Product Attributes - Part Type: Piston Rings
Product Attributes - Bore (in.): 3.937 in.
Product Attributes - Gas Ported: No
Product Attributes - Product Line: JE Pistons Pro Seal Piston Rings
Product Attributes - Oil Ring Tension: Low
Product Attributes - Oil Ring Included: Yes
Product Attributes - Oil Ring Material: Chrome plated carbon steel
Product Attributes - Top Ring Included: Yes
Product Attributes - Top Ring Material: Carbon steel
Product Attributes - Oil Ring Thickness: 2.5mm
Product Attributes - Top Ring Thickness: 1.2mm
Product Attributes - Second Ring Included: Yes
Product Attributes - Second Ring Material: Iron
Product Attributes - Second Ring Thickness: 1.2mm
Product Attributes - Top Ring Facing Material: Gas nitrided
Product Attributes - Manufacturer's Part Number: JG4904-3937
Product Attributes - Second Ring Facing Material: Phosphate coated
Product Attributes - Piston and Ring Oversize (mm): Standard
Product Attributes - Piston and Ring Oversize (in.): Standard

Reference Information

Brand Name/s	JE Pistons
StreetFX SKU	jepJG4904-3937
SFX Item ID	4358612
Supplier Item Code	4358612
Manufacturer SKU	JG4904-3937
Manufacturer UPC	193564241924
Alternative References	EJ257, w/EJ20

Compatibility

Application Data

Universal	No
Engine Type	H4
Make	SUBARU
Beginning Year	1996
Ending Year	1999
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications.

Universal	No
Engine Type	H4
Make	SUBARU
Beginning Year	1999
Ending Year	2005
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications (-0.015 in. deck clearance).

Universal	No
Engine Type	H4
Make	SUBARU
Model	BAJA
Beginning Year	2004
Ending Year	2006
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications (fits XT models).

Universal	No
Engine Type	H4
Make	SUBARU
Model	FORESTER
Beginning Year	2004
Ending Year	2013
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications (fits XT models).

Universal	No
Engine Type	H4
Make	SUBARU
Model	IMPREZA
Submodel	WRX
Beginning Year	2006
Ending Year	2014
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications.

Universal	No
Engine Type	H4
Make	SUBARU
Model	IMPREZA
Submodel	WRX STI
Beginning Year	2004
Ending Year	2014
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications (also fits 2015-17 models).

Universal	No
Engine Type	H4
Make	SUBARU
Model	LEGACY
Beginning Year	2004
Ending Year	2017
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications ( fits GT models).

Universal	No
Engine Type	H4
Make	SUBARU
Model	OUTBACK
Submodel	XT
Beginning Year	2005
Ending Year	2006
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications (also fits 2007-17 models).

Universal	No
Engine Type	H4
Make	SUBARU
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications (with EJ20 cylinder head).

Universal	No
Engine Type	H4
Make	SUBARU
Engine Family	Subaru 4-cylinder
Engine Size	2.5L/2458cc
Application Notes	This set is designed to work with forged side relief (FSR) designs and will work with turbocharger and nitrous applications (with EJ20 cylinder head).