The IAG Performance Hand-Built Subaru EJ25 Closed Deck Long Block Engine Packages are a complete, valve cover to valve cover, crate engine. These engines offer significant ease of installation for customers seeking a complete “drop-in" engine package for their WRX, STI, Forester XT or Legacy GT. The Long Blocks feature a combination of our proven IAG Performance 1150 Closed Deck Short Block and IAG 1150 Cylinder Head packages, along with other race-proven components to complete the assembly. When paired with our Long Block Installation Packages, you have a true plug-and-play solution to get you back on the road, FAST! All components included are BRAND NEW and there is NEVER A CORE CHARGE required.
BUILT WITH 100% NEW COMPONENTS
The IAG 1150 package is ideal for clients looking for an engine package to support up to 1150 BHP applications. The IAG 1150 Long Block features our IAG 1150 Closed Deck Short Block that utilizes a brand new EJ25 Subaru case that is converted to closed deck and is bored and honed to 99.75mm. The IAG 1150 block features 14mm head stud machining, as well as our Fire-Lock™ gasket solution that 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 combination of the alloy compression shims and gaskets assure maximum sealing for a Subaru EJ25 turbocharged engine. The IAG 1150 internals includes IAG-Spec JE FSR 2618 forged pistons that have an Electroless nickel plated coating and wrist pins that are sized to .250" / .927" from H13 material. The pistons are matched to IAG-Spec Tri-Beam connecting rods with ARP 625+ rods bolts, IAG-Spec Billet crankshaft and ARP main bolts.
The IAG 1150 block is then paired up with our IAG 1150 Fully CNC Ported Cylinder Heads to deliver maximum flow for high horsepower applications. The heads start as brand new Subaru OEM cylinder head castings that are CNC machined ported inside the intake and exhaust runners. The heads are resurfaced and then outfitted with complete Ferrea valve train components. The heads include +1mm oversized Comp Plus intake and exhaust valves, Ferrea Dual Drag Valve Springs, Titanium Retainers, GSC Manganese Bronze Valve guides as well as your choice of GSC Billet Stage 2 or Stage 3 camshafts. To complete the package, we add a 14mm ARP head stud set, our Fire-Lock™ head gasket solution and all required gaskets to complete the valve cover-to-valve cover assembly.
MAXIMUM POWER FOR DRAG RACING
The IAG 1150 CNC Ported Drag Cylinder Heads are designed for drag racing and competition. These fully CNC ported heads provide a significant upgrade in long term performance over the IAG 950 heads. These heads work great for cars where getting the most power with maximum reliability is the goal. The IAG 1150 heads are the best heads available for high-horsepower drag racing. They are designed to support up to 1150 BHP with supporting mods. These heads include upgraded Ferrea Comp Plus Valves, GSC Viton Valve Stem Seals, Upgraded GSC Valve Guides, Ferrea Dual Drag Valve Springs with Titanium Retainers, and Ferrea Keepers. GSC S2 or S3 Camshafts are available with OEM valve lifter buckets.
BUILT WITH 100% NEW COMPONENTS
Each IAG 1150 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S2 or S3 Camshafts and OEM Lifter Buckets for valve adjustment.
This IAG 1150 fully CNC ported head package starts with brand new WRX STI OEM head castings directly from Subaru of America. The bare castings are visually inspected then fixtured into our in-house Centroid 5-axis CNC Machine. The Centroid CNC ports the intake and hard to reach exhaust "dog-leg" port runner. The benefit of CNC porting is not only an efficient way of machining the heads it also offers consistent port results that are hard to achieve by hand. Once the Centroid completes the port process the heads undergo a cam clearance machining process that removes material from the lifter area where large duration cam profiles are known to contact the castings. Shortly after the heads are drilled to fit larger 1/2" or 14mm head studs, which are commonly used in high horsepower builds. Next, the OEM guides are pressed out and replaced in favor of GSC Manganese-Bronze valve guides that are shaped to improve airflow. Once all the new intake and exhaust guides are in place they are diamond-honed in our honing station. The heads are then fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of Ferrea's +1mm valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate which cuts the aluminum to a smooth even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using Ferrea Drag Springs and Retainers along with Ferrea Viton stem seals.
WHAT MAKES CNC PORTING BETTER?
Cylinder head porting has been around since the invention of the internal combustion engine. It can be done by hand with a die grinder and some cartridge rolls, and a seasoned professional can likely get a good result that way. Unfortunately, doing porting this way requires a lot of experience and care. One slip of the die grinder can ruin your cylinder head. This is where CNC porting comes in. Using our Centroid 5 axis CNC porting machine we can achieve the same results every time we put a set of heads into the machine. Every cylinder head comes out exactly the same and uses our race-proven, computer controlled, CNC porting program to guarantee results.
OPTIONAL GSC S2 OR S3 CAMSHAFT AND LIFTER BUCKET PACKAGE
To get the most out of these heads you'll want to select the GSC Power-Division billet S2 camshafts for your IAG 1150 Head Package. These cams are built to suit the higher horsepower these heads will support. With a power range of 500 WHP and up, you need some additional supporting mods to utilize the true potential of the S2s. Our IAG 1150 Short Block, an upgraded turbocharger and fuel system, and a quality engine management system are key.
If you're targeting maximum power over 1000 whp and willing to give up some low end drivability, the GSC S3 cams are the way to go. PLEASE NOTE THAT THESE CAMS REQUIRE A STANDALONE ECU AND MAY NOT FUNCTION CORRECTLY WHEN AVCS IS USED. Along with the camshafts we'll include all new OEM valve lifter buckets and set valve lash so the engine will be ready to install and run.
IAG 1150 Closed Deck EJ25 2.5L Long BLock Includes:
IAG 1150 Closed Deck EJ25 Short Block:
- Case Halves - Converted to Closed Deck from brand new OEM Subaru case halves, bored and honed to 99.75mm.
- Pinned Mains - Machine case for 9.5mm pinned mains and lined honed.
- Fire-Lock™ - IAG Fire-Lock™ receiver groove machining, latest solution to prevent head gasket failure on high horsepower and high boost Subaru's - *IAG Fire-Lock™ head gaskets required
- Head Studs - Machined for 14mm Head Studs.
- Pistons - IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Electroless Nickel Plated Tops & Ring area, Ring Set, .250" / .927" H13 Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
- Connecting Rods - IAG-Spec +2mm Tri-Beam Connecting Rods with ARP 625+ Rod Bolts.
- Rod / Main Bearings - ACL or King Race Bearings.
- Crank - IAG-Spec Billet Crank
- Case / Main Bolts - ARP Main Bolts.
IAG 1150 Fully CNC Ported Cylinder Heads:
- Heads - Brand New Subaru OEM WRX STI Cylinder Head Castings
- Machine Porting - CNC Ported Intake and Exhaust Runners
- Intake Valves - Ferrea 37mm (+1mm) Comp Plus Intake Valves
- Exhaust Valves - Ferrea 33mm (+1mm) Comp Plus Exhaust Valves
- Springs / Retainers - Ferrea Dual Valve Springs & Titanium Retainers
- Keepers - Ferrea Valve Keepers
- Guides - GSC Manganese Bronze Valve Guides
- Valve Seals - GSC Valve Stem Seals
- Lifters - OEM Lifter Buckets
- Camshafts - GSC Stage 3 Billet Camshafts
- Multi-Angle Valve Job
- Machined Cam Lobe Clearance
- Drilled For 14mm Heads Studs
- Resurface
- Ultrasonic Cleaning
- Final Lash
Gaskets, Hardware & Accessories:
- Head Studs - IAG / ARP 14mm Set
- Head Gaskets - IAG Fire-Lock™
- Valve Cover Gaskets - OEM
- Cam Seals - OEM
- Valve Covers - OEM
- Wrist Pin Seal, Rear Main Seal & Separator Kit
- Crankshaft Woodruff Key
