Engine Assembly Parts

The IAG Long Block Engine Basic Installation Kits provide all of the basic components needed to install one of our EJ25 Long Block Engine Packages in one complete kit. All fluids for initial break-in are included. Just select the kit which fits your year...

The IAG Long Block Engine Basic Installation Kits provide all of the basic components needed to install one of our FA20F DIT WRX Long Block Engine Packages in one complete kit. All fluids for initial break-in are included. Components Included: (x2)...

The IAG Performance / JE Pro Seal Subaru MLS head gaskets were designed specifically for use with IAG's 14mm Head Stud Sets. The gaskets are manufactured from stainless steel material and feature enlarged head stud holes to clear 14mm head studs without...

The IAG Performance / JE Pro Seal Subaru MLS head gaskets were designed specifically for use with IAG's 14mm Head Stud Sets. The gaskets are manufactured from stainless steel material and feature enlarged head stud holes to clear 14mm head studs without...

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...

The IAG Performance Fire-Lock head gasket solution was created after years of research and development testing to prevent head gasket failure on high horsepower and high boost Subaru EJ Series engines. This solution is loosely derived from diesel...

The IAG Performance Cooper ring head gasket is manufactured from an asbestos-free composite raw material and features silicone based beading applied to critical areas to improve sealing around all water and oil passages. What sets this gasket apart from...

The IAG Performance Cooper ring head gasket is manufactured from an asbestos-free composite raw material and features silicone based beading applied to critical areas to improve sealing around all water and oil passages. What sets this gasket apart from...

The IAG Copper O-Ring Wire & Install Tool Kit is intended for use with our case halves or short blocks. The kit includes (4) lengths of copper o-ring wire and a wooden tool handle end intended to press the o-ring wire into the machined groove without...

The IAG Performance 1/2 Inch Head Stud Set is manufactured by ARP and is designed for use on high horsepower Subaru EJ25, FA20, and FA20 DIT engines. Due to the larger size of the head studs, a greater load can be placed on the fasteners and in turn it...

IAG's / ARP 14mm Head Stud Set is designed for use on high horsepower Subaru engines. The larger size of the stud increases its load capacity which in turn helps to prevent the cylinder head from lifting and creating head gasket failures. The oversized...

Not planning on reusing your original short block service plugs and covers? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal, (3) OEM wrist pin plugs, (3) OEM wrist pin plug washers, (1) OEM separator cover, (6) OEM...

Not planning on reusing your original short block oil plugs? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal and (3) OEM Oil Plugs. * Never reuse a rear main seal on a new short block.* Please note all IAG FA20 DIT...

Not planning on reusing your original short block oil plugs? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal and (2) OEM Oil Plugs. * Never reuse a rear main seal on a new short block. * Please note all IAG FA20...

The IAG Performance 14mm Head Stud Dowel is specifically designed to work our 14mm ARP head studs and machined cases. Subaru short blocks or cases that are machined for 14mm head studs will require (x2) dowels per side or (x4) dowels total. Dowels are...

The IAG ARP 14mm Head Stud Nut is intended to directly replace (1) of the nuts included with our 14mm Head Stud Set with part number: IAG-ENG-1711. The nuts are sold individually, (x12) are required for (1) engine or (x6) per cylinder head.  PDF...

The IAG ARP 14mm Head Stud is intended to directly replace (1) of the studs included with our 14mm Head Stud Set with part number: IAG-ENG-1711. The replacement studs are sold individually, (x12) are required for (1) engine or (x6) per cylinder head...

The IAG ARP 14mm Head Stud Washer is intended to directly replace (1) of the washers included with our 14mm Head Stud Set with part number: IAG-ENG-1711. The washers are sold individually, (x12) are required for (1) engine or (x6) per cylinder head...

The IAG ARP 1/2" Head Stud Nut is intended to directly replace (1) of the nuts included with our 1/2 Inch Head Stud Set with part number: IAG-ENG-1700. The nuts are sold individually, (x12) are required for (1) engine or (x6) per cylinder head.  ...

The IAG ARP 1/2" Head Stud is intended to directly replace (1) of the studs included with our 1/2 Inch Head Stud Set with part number: IAG-ENG-1700. The replacement studs are sold individually, (x12) are required for (1) engine or (x6) per cylinder head...

The IAG ARP 1/2" Head Stud Washer is intended to directly replace (1) of the washers included with our 1/2 Inch Head Stud Set with part number: IAG-ENG-1700. The washers are sold individually, (x12) are required for (1) engine or (x6) per cylinder head...

IAG Performance carries the OEM Subaru FHI 2.0L & 2.5L engine short block case half bolts in a complete set. This set fits 2002-14 Subaru WRX, 2004-21 Subaru STI, 2005-09 Legacy GT and 2004-08 Forester XT. Includes (x8) 800210990 (x1) 800708630 (x6)...

IAG billet aluminum half moon valve cover cam seals replace the OEM style rubber seals that are prone to leaking and failure as they age. The seal set comes in a complete set of four and features black anodized oem like finish.

IAG billet aluminum half moon valve cover cam seals replace the OEM style rubber seals that are prone to leaking and failure as they age. Sold in a complete set of four. (Silver Finish)

IAG AVCS Camshaft Sensor Plugs (Pair). Designed for early 2002-2005 WRX's that have upgraded to AVCS cylinder heads but do not have engine management to support AVCS sensors. Comes in a black anodized finish. Includes: (x2) CNC Billet Plugs (x2) O-ring...

The Subaru FA20 cylinder heads use pressed-in freeze plugs from the factory. It's common for the plugs to fall out, lose coolant externally or even internally into the oil. Unfortunately, most of the freeze plugs are located behind the timing cover and...

IAG TIMING BELT KIT WITH IAG RED RACING BELT, TIMING GUIDE, IDLERS & TENSIONER ...

IAG TIMING BELT KIT WITH IAG RED RACING BELT, TIMING GUIDE, ADJUSTABLE IDLERS & TENSIONER ...

The IAG Performance billet timing belt guide is the best method to prevent your EJ engine from skipping a beat. Engineered and manufactured in our facility in Westminster, MD, each guide is machined from a single piece of 6061 billet aluminum and then...

The latest OEM Subaru tensioners work well for mild performance applications, but when used on vehicles with sequential transmissions or on high-revving engines, the tensioner may lose its ability to control the belt. This would, in turn, cause the...