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IAG Performance Cylinder Head Gasket Fire-Lock Head Gaskets (1 Pair w/ Fire-Lock Rings) for EJ25/EJ257, 100mm, .051"

Engine Cylinder Head Gasket


IAG Fire-Lock Head Gaskets (1 Pair w/ Fire-Lock Rings) for Subaru EJ25 / EJ257, 100mm, .051", for 14mm Head Studs.

  • Unique Fire-Lock Rings help contain extreme cylinder pressures. Cylinder liners must be machined to accept the fire-lock rings.
Pricing: $299.99

Free ground shipping on all order over $100.00 (some exclusions may apply)


Subaru: WRX STI 13 - 21 Sport-tech / Tsurugi Edition / Launch Edition / Sport / Base / Limited / Series.HyperBlue / Kanrai Edition / STI / Type RA / S209, Subaru: WRX 12 - 16 Limited / Base / STI, Subaru: Baja 04 - 06 Turbo, Subaru: Outback 05 - 09 2.5 XT / XT Limited / XT, Subaru: Forester 04 - 13 XT Sports / Sports 2.5 XT / XT / XT Premium / XT Limited / XT Touring / 2.5 XT, Subaru: Impreza 04 - 14 WRX STI Special Edition / WRX SE / WRX GT / WRX Premium / 2.5 GT / WRX STI Limited / WRX STI / WRX / WRX Limited / WRX TR, Subaru: Legacy 05 - 13 2.5GT / GT spec.B / GT Limited / GT

  • IAG ARP 14mm Head Studs Required
  • If a block or cylinder head was previously o-ringed the groove must be filled and resurfaced before using this type of gasket
  • Kit Includes: (2x) Fire-lock gaskets, (4x) Fire-lock rings
  • The gaskets are sold in pairs with four Fire-lock rings.
  • The IAG Fire-Lock gaskets require machine work for installation and are recommended for use with 14mm head stud hardware.
  • These gaskets require IAG ARP 14mm head studs to achieve the required torque necessary for proper installation. Due to the required torque, any block that was previously honed will need to go to the next size overbore. Future servicing will require cylinder head resurfacing due to an imprint left from the Fire-lock rings.

IAG Fire-Lock 2.5L Head Gaskets (1 Pair with Fire-Lock Rings) For 14mm Head Studs Only- Note Machine Work with IAG is REQUIRED. After years of research and development testing, the IAG Performance Fire-Lock head gasket is the newest solution to preventing head gasket failure on high horsepower and high boost Subaru EJ25 engines. This solution is loosely derived from diesel technology where a counterbore step is machined around each cylinder bore allowing specially sized fire rings to drop into the machined area and head gasket bores. The shims are designed to create a compression seal once the heads are installed and torqued into place. IAG fire rings are manufactured to a very strict tolerance from a proprietary alloy and are then put through a heat treatment process. The gaskets are manufactured from an asbestos-free composite raw material and feature a silicone based beading applied to critical areas to improve sealing around all water and oil passages. The combination of the alloy compression shims and gaskets assure maximum sealing for a Subaru EJ25 turbocharged engine. Features: Composite Material, IAG-Spec Alloy Ring, Specifically designed for 14mm Head Studs, Silicone Beading, 100mm Bore, .051" Thickness, Intended for High Horsepower, High Boost applications.


  • IAG-ENG-1740
  • IAG-ENG-1740
  • 887753777928
  • IAG Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 0.7 lbs.
  • W0.7000” x H0.5000” x L13.0000”
  • Free ground shipping on all order over $100.00 (some exclusions may apply)

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