The IAG 550 short block is built with IAG custom spec H-Beam forged connecting rods. These upgraded connecting rods, along with race bearings, can handle the increased engine load from larger turbochargers or higher boost levels—something the OEM STI rods in stock short blocks cannot reliably manage. This feature is just one of the many reasons why an IAG short block makes a superior EJ25 engine for our customers. 💪 | IAG Performance
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The IAG 550 short block is built with IAG custom spec H-Beam forged c…
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The IAG 750 Short Block is designed to tackle common issues in modified EJ25 engines, especially at high horsepower. It includes closed deck case halves to prevent cylinder wall cracking, forged pistons to avoid ringland failure, IAG Spec H beam connecting rods, and ACL bearings to reduce the risk of spun bearings. Give yourself peace of mind by upgrading your WRX STI today! #iagperformance #subie #wrxsti #subienation | IAG Performance
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The IAG 750 Short Block is designed to tackle common issues in modifi…
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The IAG 550 is our most popular EJ short block offering. Built using forged internals, the IAG 550 is ideal for modified EJ25 Subarus that want to upgrade their car’s reliability and performance. | IAG Performance
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The IAG 550 is our most popular EJ short block offering. Built using fo…
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The IAG Stage X Short Block starts life as Crest CNC case halves that are machined for our proprietary Fire-Lock head gasket system. A lip is carefully machined at the top of each cylinder to accommodate a Fire-Lock ring, guaranteeing a perfect seal between the combustion chamber and the cylinder head. This system has been proven to withstand extreme cylinder pressures in record setting race cars. If you are looking for the best head gasket solution for a high HP EJ engine, check out the IAG Fir
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The IAG Stage X Short Block starts life as Crest CNC case halves that …
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Have you ever wanted to know the difference in our Staged EJ25 Short Blocks and which one is best for you? Check out the full length video on the IAG Performance YouTube channel. | IAG Performance
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Check out this IAG 750 long block that is equipped with our IAG timing guide, competition tensioner, black racing timing belt, and IAG x RCM cam gears 🤩 #iagperformance #ej25 #boxerengine #builtmotor #wrxsti #subienation | IAG Performance
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The IAG Stage 2.5 Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that transform the block into a solid deck. The unique inserts feature small passages that allow needed coolant flow to the deck surface. Next, the short block is Deck Plate bored and honed to 99.75mm in our in-house Sunnen SV-30 the most advanced automotive cylinder hone available. lAG's in-house hon
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