IAG Stage 4 Tuff EJ25 Subaru Closed Deck Short Block

For WRX, STi, LGT, FXT

Rated for 1000BHP

Head Gasket Required: NOT INCLUDED

• *IAG Fire-Lock™ .051" Head Gaskets with IAG-Spec Alloy Ring Set* PN# IAG-ENG-1740

Stage 4 Tuff Closed Deck Includes:

• Case Halves -Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 99.75mm.
• 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
• Head Studs -Machine case to fit 14mm head studs - *Head studs sold separately
• Pistons -IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Electroless Nickel Plated Tops & Ring area, Ring Set, .250" / .906" H13 Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
• Connecting Rods -IAG-Spec Tri-Beam +2mm w/ ARP 625+ 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 bolts.