HKS 23011-AT008 FA24 2.5L High Compression Step 2 Short Block Assembly

The HKS 23011-AT008 is a high-compression Step 2 short block assembly engineered for the Subaru FA24 2.5L horizontally-opposed (boxer) engine. Built by HKS — one of Japan's most respected performance engineering companies — this short block is designed for enthusiasts and tuners seeking a robust foundation for high-output FA24 builds.

HKS short blocks are precision-assembled using upgraded internal components selected to withstand elevated boost pressures, higher compression ratios, and increased power output compared to the OEM specification. The Step 2 designation indicates this unit is built for performance-oriented applications that go beyond stock power levels, making it an ideal platform for forced-induction or naturally aspirated high-performance builds.

Key Features:

• Application: Subaru FA24 2.5L boxer engine
• Configuration: High-compression Step 2 specification short block
• Manufacturer: HKS — Japanese OEM-quality precision assembly
• Design: Drop-in short block assembly ready for performance builds
• Build Quality: Machined and assembled to tight tolerances for reliability under performance demands
• Part Number: 23011-AT008

This short block is intended for experienced builders and professional installers. It provides the rotating assembly and block foundation needed to support a complete high-performance FA24 engine build. As with all HKS engine internals, professional installation and proper engine management tuning are strongly recommended to maximize performance and longevity.