The AMS Subaru STI 600HP EJ25 Short Block is the ultimate solution for high horse power reliability. We use only the best off the shelf and custom designed AMS spec components. Combine that with the latest in machine and assembly practices and you are assured only the best!

All our engines are hand assembled at AMS using the same care as the engine in our 1142 awhp, world record holding AMS Drag EVO. Every motor is balanced, blueprinted and assembled to AMS’ exacting standards.

Before assembly each block is checked for correct dimensions, cylinder bore, mains, block flatness, etc… to ensure you get the best foundation for your new engine. Every engine we assemble has a build sheet where tolerances, torque specs, and clearances are documented.

Includes

    * JE Pistons
    * Manley H-beam Rods
    * Brand new short block
    * High performance rod & main bearings
    * Precision AMS spec machine work on block & crank
    * Precise, documented hand assembly