Shortblock 10103AD020 for Subaru Type RA EJ25 STI

The Type RA EJ25 STI Shortblock (OEM 10103AD020) is a genuine Subaru performance engine base featuring an improved piston design for enhanced strength and reliability. Factory-assembled with precision components—including the crankcase, crankshaft, connecting rods and upgraded pistons—it provides a robust foundation for high-performance builds and OEM-spec engine replacements. Manufactured to Subaru’s performance standards, it ensures durability, accuracy and long-term dependability in demanding STI applications.

Manufacturer: Subaru
OEM Part Number: 10103AD020