IAG Performance Magnum EJ20 Subaru Closed Deck Short Block | 2002-2005 Subaru WRX (IAG-ENG-S955) IAG Performance

2002-2005 Subaru WRX Stage 2.5 EJ20 Subaru Closed Deck Short Block Heads by IAG

The IAG Magnum EJ20 Short Block starts with brand new Subaru 2.0L 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.

The case halves are then CNC machined for our new Fire-Lock head gasket solution that is loosely derived from diesel technology where a counterbore step is machined around each cylinder bore allowing specially sized fire rings to drop into the machined area and head gasket bores. The Magnum case is then drilled and tapped to accept 14mm head studs that combined with the IAG Fire-Lock head gasket set greatly reduces head gasket failure during high cylinder pressure scenarios. Next, the short block is Deck Plate bored and honed to 92.5mm in our in-house Sunnen SV-30 the most advanced automotive cylinder hone available.

IAG’s in-house honing process is able to set custom piston to wall clearances to best fit your needs. The modified case halves are then assembled using a new Subaru 2.0L crankshaft with improved oil passages that is matched to ACL or King race main bearings. IAG-Spec Tuff H-Beam +2mm connecting rods and ARP 625+ rod bolts are utilized along with ACL or King race rod bearings. The case halves are sealed with new OEM main/case bolts and sealant (upgrading to ARP mains requires line honing).

Finally, IAG-Spec 92.5mm JE FSR 2618 Forged Pistons with electroless nickel plated tops and ring area as well as upgraded .250″ / .906″ H13 wrist pins are added to finish the Magnum short block. Additionally, all IAG-Spec piston skirts utilize the JE Perfect Skirt coating.

Features

• Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 92.5mm
• 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
• Machine Case for 14mm head studs – *Head studs are sold separately
• IAG-Spec JE FSR 92.5mm 2618 Forged Pistons, Electroless Nickel Plated Tops & Ring area, Ring Set, .250″ / .906″ H13 Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
• IAG-Spec Tuff H-Beam +2mm / ARP 625+ Rod Bolts
• ACL or King Race bearings
• New Subaru EJ20 WRX Crankshaft with improved oil passages
• Standard FHI Subaru case bolts

Benefits

• Increased Performance Capabilities
• Improved Reliability

Please Note: IAG Recommends JE Pro Seal .039 inch head gaskets.

Applications

• EJ20 Engines

What’s In The Box?

• 1 – Complete IAG Short Block

References

• Installation Instructions, Warranty Info, and Break-In Documentation

Warranty

• IAG offers a one year/12,000-mile warranty