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IAG Performance 1000+ Long Block 1000+ Closed Deck Long Block Engine w/ Stage 5 Heads

Engine Long Block


IAG 1000+ Closed Deck Long Block Engine w/ Stage 5 Heads for 08-21 STI.

  • 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.
Pricing: $17,449.99

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 STI, Subaru: Impreza 08 - 14 WRX STI Limited / WRX STI Special Edition / WRX STI

  • All IAG Longs Blocks are crated and shipped by freight trucks which include lift gate service.
  • IAG 1000+ Long Block Engine Includes: Stage 4 Extreme Closed Deck Includes: 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 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. Stage 5 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 Copper / Bronze Valve Guides Valve Seals - Ferrea 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 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
  • IAG's Break-in Instructions MUST be followed, and the long block must be professionally installed for the 12 month/12,000 mile workmanship warranty to be applicable.
  • If the previous engine experienced an internal failure then all oiling components (i.e. cooler, pump, pickup, cam gears, and solenoids, etc) as well as other necessary components as per your installer's recommendations, must be replaced during installation.
  • Please review the PDF document below regarding installation, break-in procedures and warranty information.
  • Power: The IAG 1000+ Long Block has a power output rating of 1000+BHP. All IAG short blocks are balanced and blueprinted.

IAG 1000+ EJ25 Closed Deck Long Block w/ Stage 5 Heads: The IAG Performance Hand-Built Subaru EJ25 Closed Deck Long Block Engine Packages are a complete, valve cover to valve cover, crate engine. The Long Blocks feature a combo of our proven IAG Performance Closed Deck Short Block and Cylinder Head packages, along with other race-proven components to complete the assembly. When paired with our Long Block Install 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! The IAG 1000+ package is ideal for clients seeking an engine to support up to 1000+ BHP. The IAG 1000+ Long Block features our Stage 4 Extreme 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 Stage 4 Extreme block features 14mm head stud machining as well as our Fire-Lock gasket solution. The combination of the alloy compression shims and gaskets in the Fire-Lock system assure maximum sealing for a Subaru EJ25 turbocharged engine. The Stage 4 Extreme internals include IAG-Spec JE FSR 2618 forged pistons with an Electroless nickel plated coating and wrist pins 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 Stage 4 Extreme block is paired with our Stage 5 Fully CNC Ported Cylinder Heads to deliver maximum flow. The heads start as new Subaru OEM castings that are CNC machine ported and resurfaced. They are then outfitted with complete Ferrea valve train components including +1mm oversized Comp Plus intake and exhaust valves, Ferrea Dual Valve Springs, Titanium Retainers, Ferrea Copper/Bronze Valve guides and GSC Billet Stage 3 camshafts. Finally, 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.


  • IAG-ENG-4040W
  • IAG-ENG-4040W
  • 887753779250
  • IAG Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 285.0 lbs.
  • W32.0000” x H28.0000” x L46.0000”
  • Free ground shipping on all order over $100.00 (some exclusions may apply)

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