item: IAG Performance Fire-Lock Head Gaskets w/Fire-Lock Rings - Pair (EJ25/EJ257)
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.
The IAG Fire-Lock gaskets require machine work for installation and are recommended for use with 14mm head stud hardware. The gaskets are sold in pairs with four Fire-lock rings.
- If a block or cylinder head was previously o-ringed the groove must be filled and resurfaced before using this type of gasket.
- 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.
- 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 ARP 14mm Head Studs Required
- Gaskets sold in pairs
- (2) Head Gaskets
- (4) Fire-Lock Rings
- 2001-2014 Subaru WRX (EJ25)
- 2002-2018 Subaru STI (EJ25)
- 2004-2009 Subaru Liberty GT (EJ25)
- 2003-2013 Subaru Forester XT (EJ25)