The IAG Performance / Crest CNC 2.5L Subaru Billet Aluminum Short Block aspires to revolutionize the Subaru performance tuning market by reinventing the EJ and addressing virtually every weakness that exists in max-power builds. The Stage X Billet Short Block is engineered to eliminate case flex in high-power EJ builds, making it possible to reliably run at a power output rating of 1150+BHP. This short block is equipped with radiused coolant and oil galleries to improve flow, a 4-bolt bottom end for added strength, and replaceable iron sleeves, making rebuilds easier. If you are looking for an EJ engine that can deliver high horsepower without any compromises, then the Crest CNC/IAG Stage X billet short block is the perfect choice!
The Stage X Billet Short Block is a complete short block built by IAG on the Crest billet platform. Crest CNC (formerly Willall), is renowned for their precision-machined billet aluminum engine blocks and components. With Crest’s proven track record of producing blocks that endure the rigors of high-output engines, combined with our expertise in high-powered aftermarket Subaru builds, this collaboration delivers an unbeatable foundation for those pushing the limits of performance.
The Stage X Billet Short Block case is precision machined by Crest CNC using 6061-T6 Aerospace Aluminum and reinforced with Darton Ductile Iron Sleeves. The billet case halves are meticulously hand-assembled by our expert Subaru technicians, and include the IAG Spec Billet crankshaft, custom IAG-Spec +2mm Tri-Beam connecting rods and ARP 625+ rod bolts, along with IAG Spec JE 99.5mm FSR 2618 forged pistons. The Stage X Short Block also includes ACL or King rod and main bearings and is balanced and blueprinted. Finally, the case halves are sealed with new ARP main/case bolts and sealant.
IAG Performance / Crest CNC Stage X 2.5L Billet Aluminum Short Block Includes:
- Case Halves -Crest Billet / Sleeved Case Halves
- 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
- Machining -Machined for 14mm Head Studs *(Studs sold separately / Note the proper head gaskets or head gasket modifications are required for proper fitment with 14mm studs.
- Pistons -JE 99.5mm FSR 2618 custom forged pistons, JE Pro Seal Ring Set, .250" H13 .927" tool steel wrist pins, Clips
- Connecting Rods -Custom IAG-Spec +2mm Tri-Beam Forged Connecting Rods with ARP 625+ Rod Bolts.
- Rod / Main Bearings -ACL Race Bearings
- Crank -IAG-Spec Billet 79mm Crankshaft
- Case / Main Bolts -ARP Case Bolts
Compression Ratio:
- 8.5:1 on D Cylinder Heads (EJ255)
- 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket.
Additional Options Available:
- Head Studs -IAG / ARP Spec 14mm head studs, nuts, and washers
- Oil Pumps -IAG Stage 2 CNC Ported 11mm EJ Oil Pump
- 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 -(Includes: Wrist pin plugs, washers, separator cover, bolts, etc. In case you don't want to transfer from the original engine).
Head Gasket Required:
- *IAG Fire-Lock .051" Head Gaskets with IAG-Spec Alloy Ring Set* PN# IAG-ENG-1741