08-21 STI IAG 1000+ EJ25 Long Block Closed Deck w/ Stage 5 Heads

BALANCED, BLUEPRINTED, AND READY TO MAKE UP TO 1000+ HP

When embarking on a build that makes serious horsepower, both the risk and investment can be heavy to digest because everything needs to work together instrumentally in the build. All of the components, the hardware, and the clearances all play an imperative role in terms of reaching your power goals while remaining relatively reliable given the circumstances as with big power numbers, anything is possible. 

EJ25 Closed Deck Long Block

This is where you want to leave it to the professionals. IAG Performance who is a trusted establishment in the Subaru performance industry now offers their 1000+ EJ25 Closed Deck Long Block w/ Stage 5 Heads.

This is a fully blueprinted and assembled long block assembly that has been built for your dedicated race car, rally car, or high-powered street weapon. With a turbo large enough, and with the right fueling modifications, and with a proper tune this long block is capable of supporting up to 1000 BHP which is plenty of power for those of you who want to run a fast number at the drag strip, or who need to rush home because you need to use the bathroom. Whatever the case may be, knowing you have an engine designed and assembled by the best will give you peace of mind. 

STAGE 4 EXTREME CLOSED DECK INCLUDES:

• Case Halves: Converted to closed deck from brand new OEM Subaru case halves that are 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)
• Machined for 14mm head studs
• Pistons: IAG-Spec JE FSR 99.75mm 2618 forged pistons, electroless nickel plated tops, and 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 and Main Bearings: ACL or King Race Bearings
• Crankshaft: Billet crank by Callies
• Case and Main Bolts: ARP Main Bolts

STAGE 5 HEADS:

• Brand new Subaru OEM WRX/STI cylinder head casings
• 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 and Retainers: Ferrea Dual Valve Springs and Titanium Retainers
• Keepers: Ferrea Valve Keepers
• Guides: GSC Manganese 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 head studs
• Resurfacing
• Ultrasonic cleaning
• Final lash

GASKETS, HARDWARE, AND ACCESSORIES:

• IAG / ARP 14mm head studs
• IAG Fire-Lock head gaskets
• OEM valve cover gaskets
• OEM cam seals
• OEM valve covers
• Wrist pin seal, rear main seal, separator kit
• Crankshaft woodruff key

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