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IAG Performance 550 Long Block 550 Long Block Engine w/ Stage 1 Heads

Engine Long Block


IAG 550 Long Block Engine w/ Stage 1 Heads for 06-14 WRX, 04-13 FXT, 05-09 LGT.

  • 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: $9,499.99

Free ground shipping on all order over $100.00 (some exclusions may apply)


Subaru: Baja 06 - 06 Turbo, Subaru: WRX 12 - 14 SE / Limited / Base, Subaru: Impreza 06 - 14 WRX TR / WRX Premium / 2.5 GT / WRX Limited / WRX / WRX SE / WRX GT, Subaru: Legacy 06 - 13 GT spec.B / GT Limited / GT / 2.5GT, Subaru: Outback 06 - 09 XT / XT Limited / 2.5 XT, Subaru: Forester 06 - 13 XT Premium / XT Touring / 2.5 XT / XT Limited / XT Sports / Sports 2.5 XT / XT

  • All IAG Longs Blocks are crated and shipped by freight trucks which include lift gate service.
  • All IAG short blocks are balanced and blueprinted.
  • IAG 550 Long Block Engine Includes: Stage 2 Short Block: Case Halves - Brand new Subaru OEM case halves 99.5mm Stock Bore Pistons - IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Steel Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin) Connecting Rods - IAG Spec H-Beam rods Rod / Main Bearings - ACL or King Bearings Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft Case / Main Bolts - Standard FHI Subaru case bolts, Stage 1 Heads: Heads - Brand New Subaru OEM WRX STI Cylinder Head Castings Intake Valves - GSC 36mm (Standard) Intake Valves Exhaust Valves - GSC 32mm (Standard) Exhaust Valves Springs / Retainers - GSC Single Valve Springs & Titanium Retainers Guides - OEM Valve Guides Valve Seals - GSC Valve Stem Seals Lifters - OEM Lifter Buckets, Camshafts - GSC Stage 1 Billet Camshafts Multi-Angle Valve Job Machined Cam Lobe Clearance Ultrasonic Cleaning Final Lash Gaskets, Hardware & Accessories: Head Studs - ARP 2000 11mm Set Head Gaskets - OEM Valve Cover Gaskets - OEM Cam Seals - OEM Valve Covers - OEM Wrist Pin Seal, Rear Main Seal & Separator Kit Crankshaft Woodruff Key
  • 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 550 Long Block has a power output rating of 550BHP.

IAG 550 EJ25 Long Block Engine with Stage 1 Heads: The IAG Performance Hand-Built 550 Subaru EJ25 Long Block 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 Subaru WRX, STI, Forester XT or Legacy GT. The Long Blocks feature a combination of our proven IAG Performance Short Block and Cylinder Head package, 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. The IAG 550 package is ideal for clients looking for a long block engine package to support up to 550 BHP applications. The IAG 550 long block features our highly popular Stage 2 short block that utilizes a brand new EJ25 Subaru case, 99.5mm IAG-Spec JE forged pistons, OEM STI Crank and IAG Spec H-Beam connecting rods. The block is then paired up with our IAG Stage 1 Cylinder Head Package which features Subaru WRX STI OEM cylinder head castings and GSC valvetrain components. To complete the package, we add an 11mm ARP 2000 head stud set and all required gaskets for the final valve cover-to-valve cover assembly. 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.


  • IAG-ENG-4005D
  • IAG-ENG-4005D
  • 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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