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

The IAG 1000 FA24 Short Block combines top-tier components and cutting-edge technology to deliver the perfect balance of street reliability and track-level power. This ultimate "weekend racer" block is engineered to handle up to 1000 BHP and built to dominate in any setting. The IAG 1000 FA24 Short Block features +2mm IAG Spec H-Beam forged connecting rods, IAG-Spec JE Pistons with electroless nickel-plated coating and H13 tool steel wrist pins. The block is precision-machined to accommodate our venerable "Fire-Lock™" head gasket system and IAG 14mm head studs (sold separately). Each IAG 1000 short block is hand assembled using ACL rod and main bearings. The versatile IAG 1000 is the perfect setup that excels on the street, the drag strip and on the track.

The IAG 1000 FA24 Short Block starts with brand new Subaru 2.4L WRX engine case halves. Our machinists machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts, transforming the block into a solid deck. Next, a pair of deck plates are attached and the short block is bored and honed to 94.25mm in our in-house Sunnen cylinder hone. IAG's in-house honing process allows us to set custom piston to wall clearances to ensure quiet operation and reduced oil consumption. The Haas mill also cuts a groove at the top of each cylinder to accept the Fire-Lock™ head gasket rings and drills each head bolt hole for 14mm head studs. The modified case halves are then assembled using a new 2022+ Subaru 2.4L heat treated WRX crankshaft and IAG-Spec Tuff H-Beam connecting rods with ARP rod bolts. IAG Short blocks feature ACL rod and main bearings and are all balanced and blueprinted. Finally, the case halves are sealed with new OEM main/case bolts and sealant.

The IAG 1000 FA24 Short Block features our proprietary "Fire-Lock" Head gasket system. This system has been proven in our record setting race cars to be the strongest Subaru head gasket system ever produced. To achieve these results our engineers separated the combustion chamber sealing from the fluid sealing aspects of the head gaskets. Our machinists carefully machine a lip at the top of each cylinder to accept the "Fire-Lock" ring. With the ring locked in place, it stands proud above the deck, providing a superior seal. The separate gasket bodies take care of sealing oil and coolant passages and keeping them out of the combustion chamber. 14mm Head studs hold the assembly together. (Fire-Lock Gaskets and 14mm Head Studs Sold Separately).

Our unique closed deck system significantly increases the strength of the OEM case halves. This process supports the cylinder walls at the top of the case in order to prevent flexing and possible cracking where the case bolt reliefs are cut into the back of the cylinder wall. During the installation process we machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts. Once the case has been machined we heat it in an oven while freezing the specially machined inserts with liquid nitrogen. The inserts are then pressed into place and then machined to a mirror finish. The unique inserts feature small passages that allow needed coolant flow to the deck surface. This means that the closed deck system does not affect the block's cooling ability and will not cause overheating, even in daily drivers.

The pistons used in the IAG 1000 FA24 Short Blocks are specifically designed to support the rigors of racing. Designed in partnership with JE, these IAG-Spec pistons feature electroless nickel plating and a 2618 Alloy. Extra thick ring lands resist collapsing under pressure. The upgraded .230" wall H13 tool steel offset wrist pins are designed to hold up to 1000 BHP without bending or breaking. The pistons also feature JE's Perfect Skirt coating.