IAG 1000 FA24 Subaru Closed Deck Short Block - 1000 BHP

IAG 1000 FA24 Short Block for 2022-24 WRX

WEEKEND RACER POWER, STREETABLE FOUNDATION

The IAG 1000 FA24 Short Block is built to blend street manners with serious track capability, designed for high-horsepower FA24 builds targeting up to 1000 BHP with the right supporting parts. It combines upgraded rotating assembly components with IAG’s machining and quality control to create a reliable base for aggressive boost and racing use.

Key upgrades include +2mm IAG-spec forged H-beam rods, JE forged pistons with a plated ring area, and heavy-duty H13 tool-steel wrist pins. The block is also machined to work with IAG’s Fire-Lock™ sealing approach and 14mm head stud hardware (sold separately). Each short block is assembled with performance bearings and built to handle demanding conditions.

100% NEW COMPONENTS + PRECISION MACHINING

This short block starts with brand-new Subaru FA24 2.4L WRX case halves. The assembled case is machined to accept IAG closed deck inserts, then bored and honed to 94.25mm using IAG’s in-house honing process to dial in piston-to-wall clearance for quieter operation and reduced oil consumption.

The case is also machined for the Fire-Lock™ ring groove and drilled for 14mm head studs. Assembly includes a new 2022+ FA24 heat-treated WRX crankshaft, IAG-spec connecting rods with ARP fasteners, ACL rod and main bearings, balancing/blueprinting, and sealing with new OEM hardware and sealant.

FIRE-LOCK™ SEALING STRATEGY

For high-boost reliability, the block is machined for IAG’s Fire-Lock™ head gasket system, which uses a dedicated combustion sealing ring and separate gasket bodies for oil/coolant sealing. This approach is intended to improve sealing at elevated cylinder pressures when paired with the required Fire-Lock™ gaskets and 14mm head studs (both sold separately).

CLOSED DECK SUPPORT FOR STRENGTH

IAG’s closed deck insert system reinforces the upper cylinder wall area to reduce flex and the risk of cracking that can occur under high cylinder pressure. The inserts are installed with a heat/freeze process and finished to a precise surface, and incorporate coolant passages designed to maintain cooling performance for street use.

PISTONS DESIGNED FOR HIGH POWER

The IAG 1000 FA24 uses IAG-spec JE FSR 2618 forged pistons with electroless nickel plating on the tops and ring area, thicker ringlands, and JE skirt coating. The piston package includes upgraded .230" wall H13 tool steel offset wrist pins intended for high-horsepower use.

IAG 1000 CLOSED DECK FA24 SHORT BLOCK INCLUDES

What's Inside:

• Case Halves – Brand new Subaru OEM case halves
• Fire-Lock – Fire-Lock™ receiver groove machining (Fire-Lock™ head gaskets required)
• Head Studs – Machined for 14mm head studs
• Pistons – IAG-Spec JE FSR 94.25mm 2618 forged pistons, electroless nickel plated tops & ring area, JE Pro Seal ring set, .230" wall .866" H13 wrist pins, clips (skirt coating and offset wrist pins)
• Connecting Rods – IAG-Spec +2mm H-beam forged connecting rods with ARP 625+ rod bolts
• Rod / Main Bearings – ACL bearings
• Crank – FHI FA24 heat-treated crankshaft
• Case / Main Bolts – Standard FHI Subaru case bolts

Compression Ratio:

• Calculated with Fire-Lock gaskets: 10.5:1

Head Gasket Required:

• IAG Fire-Lock™ .051" head gaskets with IAG-spec alloy ring set (see product page for PN)

Power Rating:

Power: The IAG 1000 FA24 Short Block supports builds targeting up to 1000 BHP with the appropriate supporting modifications.

Please Note: This item is not eligible for standard ground shipping and must be delivered via freight. 
STOCK NOTICE: This item is built to order and carries a minimum 6-8 week build time.

IMPORTANT DELIVERY NOTE: Your order is shipping Via Truck Freight which requires you to be available at the time of receipt. There is a possibility the trucking company will try to schedule a delivery time with you. At the time of delivery, the driver will hand you the delivery receipt also referred to as the bill of lading, you will use this to notate any damages to the shipment. It is important that you fully inspect the shipment from all sides and notate any dents, punctures or rips in the outside packaging on the delivery receipt. Once you've inspected your shipment from the outside, you will need to open it and check the product in its entirety for damages and notate them if any. If there is no damage sign for the package and enjoy! In the rare case, you do find that your order arrived with damages, it is important you follow these steps. - Do not refuse the product- Document the damages in as much detail as possible on the Bill of Lading
- Take numerous photos from all angles (including packaging)
- Keep the product and contact the shipping company to start the damage claim
- Contact us either by phone or email for the next steps In the situation where the delivery driver is unable to wait for you to open and inspect your product, simply document "driver was unable to wait for inspection." All damage must be noted on the Bill of Lading before signing and initiating a damage claim. If the damage is not notated before signing for the item it is assumed to be in good condition. This will forfeit the ability for a shipping claim and you will not be eligible for refund or replacement.