The IAG 550 Short Block is designed for modified EJ25 Subarus that need a stronger short block to support increased cylinder pressures created by additional boost pressure. The IAG 550 short block features IAG Spec H-Beam forged connecting rods. The upgraded connecting rods and race bearings are able to support additional engine load produced by larger turbochargers or increased boost which the OEM STI rods found in the Stock short blocks cannot support reliably.
IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP
IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP
IAG Performance
IAG 550 EJ25 2.5L SUBARU SHORT BLOCK
DESIGNED FOR STRENGTH
The IAG 550 Short Block is designed for modified EJ25 Subarus that need a stronger short block to support increased cylinder pressures created by additional boost pressure. The IAG 550 short block features IAG Spec H-Beam forged connecting rods. The upgraded connecting rods and race bearings are able to support additional engine load produced by larger turbochargers or increased boost which the OEM STI rods found in the Stock short blocks cannot support reliably.
BUILT WITH 100% NEW COMPONENTS
Each IAG 550 Short Block starts with brand new EJ25 Subaru 2.5L, 99.5mm stock bore engine case halves as standard. The case haves are carefullly measured and assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft, which is matched to ACL or King race main bearings. The IAG 550 Short Block features IAG Spec H-Beam Connecting Rods with ARP2000 rod bolts, along with ACL or King race rod bearings. The case halves are sealed with new OEM main case bolts and sealant. Finally, IAG Spec JE 99.5mm Forged Pistons are carefully selected, measured, and installed to finish off the short block.
FORGED PISTONS, DESIGNED FOR BOOST
Each IAG 550 Short Block features IAG Spec JE 99.5mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .905 x 2.250" x .180" wall carbon steel wrist pins with Tru Arc locks.
What's Inside:
IAG 550 Short Block Includes:
Case Halves -Brand new Subaru OEM case halves 99.5mm stock bore
Pistons -IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
Connecting Rods -IAG-Spec H-Beam Rods with ARP2000 rod bolts
Rod / Main Bearings -ACL or King Race Bearings
Crankshaft -Standard New Subaru Nitride Treated 2017+ STI Crankshaft
Case / Main Bolts -Standard FHI Subaru case bolt
Compression Ratio:8.5:1 on D Cylinder Heads (EJ255), 8.2:1 on B, V, and W EJ257 Heads with standard thickness gasket.
![IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP]()
![IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP]()
![IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP]()
![IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP]()
![IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP]()
![Open Box Brembo 4 Piston Rear Big Brake Kit 08-21 STI 15-21 WRX]()
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IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP
IAG 550 EJ25 2.5L SUBARU SHORT BLOCK
DESIGNED FOR STRENGTH
BUILT WITH 100% NEW COMPONENTS
Each IAG 550 Short Block starts with brand new EJ25 Subaru 2.5L, 99.5mm stock bore engine case halves as standard. The case haves are carefullly measured and assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft, which is matched to ACL or King race main bearings. The IAG 550 Short Block features IAG Spec H-Beam Connecting Rods with ARP2000 rod bolts, along with ACL or King race rod bearings. The case halves are sealed with new OEM main case bolts and sealant. Finally, IAG Spec JE 99.5mm Forged Pistons are carefully selected, measured, and installed to finish off the short block.
FORGED PISTONS, DESIGNED FOR BOOST
Each IAG 550 Short Block features IAG Spec JE 99.5mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .905 x 2.250" x .180" wall carbon steel wrist pins with Tru Arc locks.
What's Inside:
IAG 550 Short Block Includes:
- Case Halves -Brand new Subaru OEM case halves 99.5mm stock bore
- Pistons -IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
- Connecting Rods -IAG-Spec H-Beam Rods with ARP2000 rod bolts
- Rod / Main Bearings -ACL or King Race Bearings
- Crankshaft -Standard New Subaru Nitride Treated 2017+ STI Crankshaft
- Case / Main Bolts -Standard FHI Subaru case bolt
- Compression Ratio:8.5:1 on D Cylinder Heads (EJ255), 8.2:1 on B, V, and W EJ257 Heads with standard thickness gasket.
IAG 550 EJ25 2.5L SUBARU SHORT BLOCK
DESIGNED FOR STRENGTH
The IAG 550 Short Block is designed for modified EJ25 Subarus that need a stronger short block to support increased cylinder pressures created by additional boost pressure. The IAG 550 short block features IAG Spec H-Beam forged connecting rods. The upgraded connecting rods and race bearings are able to support additional engine load produced by larger turbochargers or increased boost which the OEM STI rods found in the Stock short blocks cannot support reliably.
BUILT WITH 100% NEW COMPONENTS
Each IAG 550 Short Block starts with brand new EJ25 Subaru 2.5L, 99.5mm stock bore engine case halves as standard. The case haves are carefullly measured and assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft, which is matched to ACL or King race main bearings. The IAG 550 Short Block features IAG Spec H-Beam Connecting Rods with ARP2000 rod bolts, along with ACL or King race rod bearings. The case halves are sealed with new OEM main case bolts and sealant. Finally, IAG Spec JE 99.5mm Forged Pistons are carefully selected, measured, and installed to finish off the short block.
FORGED PISTONS, DESIGNED FOR BOOST
Each IAG 550 Short Block features IAG Spec JE 99.5mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .905 x 2.250" x .180" wall carbon steel wrist pins with Tru Arc locks.
What's Inside:
IAG 550 Short Block Includes:
- Case Halves -Brand new Subaru OEM case halves 99.5mm stock bore
- Pistons -IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
- Connecting Rods -IAG-Spec H-Beam Rods with ARP2000 rod bolts
- Rod / Main Bearings -ACL or King Race Bearings
- Crankshaft -Standard New Subaru Nitride Treated 2017+ STI Crankshaft
- Case / Main Bolts -Standard FHI Subaru case bolt
- Compression Ratio:8.5:1 on D Cylinder Heads (EJ255), 8.2:1 on B, V, and W EJ257 Heads with standard thickness gasket.
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