The IAG Performance hand-built Subaru 950 2.35L Destroked Long Block Engine package is a complete, valve cover to valve cover, crate engine. This engine provides a straightforward "drop-in" solution for those looking to upgrade their 2008-2018 Subaru STI. This long block features a combination of our proven IAG EJ25 2.35L Destroked Closed Deck Short Block and IAG 950 Cylinder Head packages, along with a full range of carefully selected high-performance components to complete the assembly. When paired with our Long Block Installation Packages, you’ll 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. With +2 longer rods, and 2.0L FHI crankshaft, IAG’s Destroked Long Block decreases piston speed, optimizing the rod-to-stroke ratio. This adjustment enhances key engine dynamics such as aspiration and combustion efficiency, while minimizing component wear. In terms of performance, this means increased power output, extended ring life, and the ability to rev higher—making this long block an ideal choice for track days, rally events, or drag racing applications.

IAG 950 EJ25 2.35L Long Block Includes: IAG 950 EJ25 2.35L Short Block: Case Halves - Brand new Subaru OEM case halves, 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 - Machine Case for 14mm head studs - Head studs are sold separately, Pistons - IAG-Spec JE FSR 99.75mm 2618 Custom Pistons, Electroless Nickel Plated Tops & Ring area, Ring Set, .240" / .906" H13 Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins), Connecting Rods - Custom IAG-Spec Tuff H-Beam +2mm Forged Connecting Rods / ARP 625+ Rod Bolts, Rod / Main Bearings - ACL Race bearings, Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft, Case / Main Bolts - Standard FHI Subaru case bolts. IAG 950 CNC Ported Cylinder Heads: Heads - Brand New Subaru OEM WRX STI Cylinder Head Castings, Machine Porting - CNC Ported Intake and Exhaust Runners, Intake Valves - GSC 37mm (+1mm) Intake Valves, Exhaust Valves - GSC 33mm (+1mm) SuperAlloy Exhaust Valves, Springs / Retainers - IAG-Spec Beehive Valve Springs & Retainers, Guides - GSC Maganese Valve Guides, Valve Seals - GSC Valve Stem Seals, Lifters - Kelford DLC Coated Lifter Buckets, Camshafts - GSC Stage 2 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.
,Power: The IAG 950 Long Block has a power output rating of 950BHP.
,All IAG short blocks are balanced and blueprinted.