The CNC Billet Aluminum EJ case seeks to change the Subaru performance tuning market by reinventing the EJ and addressing virtually every weakness that exists in max-power builds.

The IAG / Crest CNC EJ Block, (Formerly Willall) is machined from 6061-T6 Aerospace Aluminum and features Darton Ductile Iron Sleeves. The block is designed with increased material thickness over the OEM cast aluminum case halves and adds a unique 4-bolt bottom end for additional strength.

Case Features:

• Machined from solid billet 6061-T6 Aerospace grade aluminum
• Darton Ductile iron sleeves
• Increased material thickness in all known weak points (around head studs, bottom end location)
• Unique 4 bolt bottom end strengthening
• Threads are rolled into the block rather than conventionally cut for much greater strength
• Full cooling system operation
• Radiused coolant and oil galleries for improved flow and less foaming/turbulence
• Fits all factory engine bay ancillaries (i.e. AC/PS/etc.)
• Multiple Times stiffer and stronger than the stock case
• Precision machined for a superior surface finish
• Hard anodized to avoid marking or straining

Additional Options:

• Bore & Hone: Bore & Hone to customer specification
• Fire-Lock: Fire-Lock machine the deck surface
• Case Bolts: ARP Case Bolts
• Head Studs: IAG / ARP 14mm Head Studs, nuts, and washers - *14mm head studs are required for this block
  
• Machining Deck: - Machine head gasket deck surface

Minimum Requirements To Build & Assemble:

• *ARP Case Bolts (Sold separately)
• 14mm Head Studs (Sold separately)
• Internal components (Pistons, Rods, Bearings, Crank, All sold separately).
• Decking head gasket surface required