IAG 1000 FA24 Closed Deck Short Block for 2022-24 Subaru WRX – 1000 BHP

IAG 1000 FA24 Closed Deck Short Block – 2022-2024 Subaru WRX – 1000 BHP

Maximum Power for the Next-Generation WRX Platform
The IAG 1000 FA24 Short Block is IAG’s flagship engine foundation for the 2022-2024 Subaru WRX (VB), rated to 1000 BHP with supporting modifications. Starting with new Subaru FA24 2.4L WRX case halves, IAG machines the block to accept their closed deck inserts, bores and hones to 94.25mm, and assembles with a new FA24 heat-treated WRX crankshaft, IAG-Spec +2mm H-Beam forged connecting rods with ARP fasteners, IAG-Spec JE FSR 2618 forged pistons with electroless nickel plating and H13 tool steel wrist pins, and ACL or King race bearings. The block is machined for IAG’s Fire-Lock sealing system and 14mm head studs.

DETAILS

• Rated to support up to 1000 BHP with supporting modifications
• Designed for 2022-2024 Subaru WRX (VB) with FA24 2.4L engine
• IAG closed deck conversion — structural support for cylinder walls under boost
• Bored and honed to 94.25mm
• IAG Fire-Lock sealing system machined into deck
• Case machined for 14mm head studs (sold separately)
• IAG-Spec +2mm H-Beam forged connecting rods with ARP fasteners
• IAG-Spec JE FSR 2618 forged pistons — electroless nickel-plated tops, H13 wrist pins, thicker ringlands
• New 2022+ FA24 heat-treated WRX crankshaft
• ACL or King race rod and main bearings
• Balanced and blueprinted
• Ships via freight — allow 6-8 week build time
• Fits: 2022-2024 Subaru WRX (VB)

IAG’s FA24 Closed Deck System
The FA24 2.4L engine in the VB WRX uses a similar open deck architecture to the EJ and FA20 predecessors, and IAG’s closed deck conversion addresses the same structural vulnerability — cylinder wall flex under elevated boost. IAG machines the FA24 case halves using the same Haas VF-4SS process and thermal press-fit method, and inserts include coolant passages to maintain deck surface cooling.

Fire-Lock Sealing and 14mm Head Stud Machining
The FA24 block is machined for IAG’s Fire-Lock sealing system and 14mm head stud fitment. Fire-Lock separates combustion sealing from fluid sealing with a dedicated fire ring that drops into a machined counterbore at each cylinder — proven across IAG’s EJ and FA20 competition programs. Fire-Lock gaskets and 14mm head studs are sold separately.

Upgraded Pistons for the FA24
The IAG-Spec JE FSR 2618 forged pistons for the FA24 include electroless nickel plating, thicker ringlands than factory spec, and H13 tool steel wrist pins — all addressing failure modes at high power output.

Why Choose IAG Performance

IAG Performance has been building Subaru-specific engine and drivetrain components since 2001, and in that time they have become the standard by which serious Subaru builds are measured. Based in Westminster, Maryland, IAG designs, machines, and assembles their products in-house using Haas CNC equipment and their own engineering team. Their catalog spans everything from short blocks and long blocks rated to 1150 BHP all the way down to the fuel system, oiling, and drivetrain hardware that keeps modified Subarus running reliably for years. Every IAG product exists because a problem needed a better solution than what was available — and the engineering shows.

The RallySport Take

The IAG 1000 FA24 is the short block for the VB WRX owner who wants to take the platform to its performance potential. IAG has been building short blocks for the WRX since the EJ20 era, and the engineering knowledge from those programs is reflected here. If you are building a 2022+ WRX for serious track use or high-power street performance, this is the foundation.

Fitment