HKS Short Block 2.5L FA24 High Comp Step 2 - 2022-2024 Toyota GR86 / Subaru BRZ
HKS Short Block 2.5L FA24 High Comp Step 2 - 2022-2024 Toyota GR86 / Subaru BRZ
HKS Short Block 2.5L FA24 High Compression Step 2 for the 2022+ GR86 and BRZ
The HKS Short Block 2.5L FA24 High Compression Step 2 for the 2022-2024 Toyota GR86 and Subaru BRZ is a fully assembled short block engine assembly, providing the foundation for a high-performance FA24 build. HKS assembles the short block using matched and balanced components. Pistons, connecting rods, crankshaft, to a specification that exceeds the factory build quality and provides a platform for the head, intake, and forced induction work that defines a serious FA24 build.
Specs & Highlights
- HKS assembled 2.5L FA24 short block
- High compression Step 2 specification
- Matched and balanced internal components
- Factory-exceeding assembly quality
- Provides foundation for complete high-performance FA24 build
- Fitment: 2022-2024 Toyota GR86 / Subaru BRZ
11.5:1 Compression, Same Forged Spec as Step 1
The Step 2 short block uses forged pistons at approximately 11.5:1 compression ratio, reduced slightly from the Step 1's 12.5:1 to accommodate boost pressure in supercharged and turbocharged applications while maintaining a higher ratio than a dedicated low-compression boosted build would use. Bore and stroke are stock at 91.0mm × 96.0mm. Connecting rods and crankshaft are the same forged and balanced specification as the Step 1. Step 2 is HKS's recommendation for the GT2 supercharger and GTIII-RS turbo kit applications, where the 11.5:1 ratio provides a good balance between naturally aspirated throttle response and forced induction power ceiling.
Step 2 Targets Boost Applications and Head-Worked Builds
The Step 2 high compression specification defines the compression ratio at which the short block is assembled. Step 1 is the lower compression option, appropriate for builds that will run boost or want a moderate NA compression increase. The compression ratio affects the entire tune of the build. The short block specification should be chosen based on your target power level and fuel availability.
HKS's Recommendation for GT2 Supercharger and GTIII-RS Turbo Builds
Short block builds require significant additional components: cylinder head, camshafts, intake system, exhaust, and ECU management. The HKS short block is the foundation. The quality of the complete build around it determines the outcome. Professional engine assembly and calibration are required.
The FT Breakdown
The HKS FA24 short block is for builders who want the complete engine foundation from a manufacturer with direct experience in high-performance FA24 development. HKS builds supercharger systems, turbo kits, and camshaft packages for this engine. The short block reflects that accumulated knowledge. Step 2 is the specification for your use case. The 11.5:1 compression ratio specification for the Step 2 short block is the result of HKS calibrating the compression target for the GT2 supercharger and GTIII-RS turbo kit applications that represent the most common high-power FA24 builds. Starting from a properly spec'd short block calibrated for your forced induction system produces an engine that performs consistently across its operating range rather than one that has been assembled from parts that were not designed to work together.