For WRX, STI, LGT, FXT

Rated for +1150BHP

Head Gasket Required: NOT INCLUDED

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

Stage 4 Extreme Closed Deck Includes:

• Case Halves -Converted to Closed Deck from brand new OEM Subaru case halves, bored and honed to 99.75mm.
• 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
• Head Studs -Machined for 14mm Head Studs.
• Pistons -IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Electroless Nickel Plated Tops & Ring area, Ring Set, .250" / .927" H13 Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
• Connecting Rods -IAG-Spec Tri-Beam Connecting Rods with ARP 625+ Rod Bolts.
• Rod / Main Bearings -ACL or King Race Bearings.
• Crank -IAG-Spec Billet Crank
• Case / Main Bolts -ARP Main Bolts.