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.
- 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:
- 9.1:1 on on D Cylinder Heads (EJ255)
- 8.8:1 on B, V and W EJ257 Heads with IAG Fire-Lock™ head gaskets..
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