IAG Stage 2.5 Subaru EJ20 Closed Deck Short Block
The IAG Stage 2.5 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. 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 H-Beam connecting rods and ARP 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. Finally, IAG-Spec 92.5mm JE FSR 2618 Forged Pistons with .210" 9310 Steel Wrist Pins are added to finish the Stage 2.5 2.0L short block.
Stage 2.5 Closed Deck Includes:
Case Halves -Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 92.5mm.
Pistons -IAG-Spec JE FSR 92.5mm 2618 Forged Pistons, Ring Set, .210" 9310 Steel Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
Connecting Rods -IAG-Spec H-Beam / ARP2000 Rod Bolts.
Rod / Main Bearings -ACL or King Race bearings.
Crankshaft -New Subaru WRX 2.0L Crankshaft with improved oil passages.
Case / Main Bolts -Standard FHI Subaru case bolts.
Additional Options Available:
Oil Pump -Subaru JDM 12mm High Volume Oil Pump or 11mm Subaru Oil Pump
Head Gaskets -JE Pro Seal .039 inch Head Gaskets - (PN# SB1000-039 for S20)
IAG Oil Pickup - Upgraded oil pickup featuring heavy gauge steel tubing, 2 point bracket & mesh filter
IAG Oil Baffle - Upgraded oil control baffle and windage tray
IAG Oil Pickup & Baffle Set - Upgraded oil pickup, oil control baffle, and windage tray
Hardware / Seal Option -(Wrist pin plugs, washers, separator cover, bolts, etc. In case you don't want to transfer from the original engine).
- 8.5:1 on S20 Cylinder Heads (EJ20)
Head Gasket Recommendations:
- *IAG Recommends JE Pro Seal .039 inch head gaskets
- JE PN# SB1000-039 are for use with S20, (02-05 WRX)
Power: The IAG Stage 2.5 Short Block has a power output rating of 700BHP.
*All IAG short blocks are balanced and blueprinted.
Hardware / Seal Option:
Not planning on reusing your original short block service plugs and covers? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal, (3) OEM wrist pin plugs, (3) OEM wrist pin plug washers, (1) OEM separator cover, (6) OEM separator cover bolts, (1) OEM wrist pin service cover, (1) OEM wrist pin service cover O-ring and (2) OEM wrist pin service cover screws. *If you are reusing your original wrist pin service plugs and covers always replace the (3) OEM wrist pin plug washers and (1) wrist pin service cover O-ring before installing a short block to avoid potential leaks. *Never reuse a rear main seal on a new short block.
IAG Performance is confident in their products and services and proudly stand behind their workmanship. Therefore, they offer a limited warranty against defects in workmanship or materials, covering both parts and labor, for a standard period of 1-Year/12,000-Miles or an enhanced warranty of 2-Years/24,000 -Miles if installed by an IAG Certified Engine Installer.
Patterson Performance is an IAG Certified Engine Installer. Any IAG shortblock / longblock purchased from, installed by and tuned at Patterson Performance qualifies for the 2-year / 24,000 mile warranty.