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Street Spec Standard Shortblock

Designed for the low noise and long life essential for a daily driven street application while easily handling increased power outputs and weekend track use. Buit to exacting strandards from the highest quality components.

This short block utilizes all new components and is sold outright with no core exchange required. We start with an ultrasonically cleaned block case from Subaru. The rotating assembly starts with a salt bath nitride hardened crankshaft running in King XPG race-series bearings. The connecting rods are precisely machined for RalliSpec using South American 4340 forgings and an extremely high strength H-beam design. FEA-evaluated design features around the large and small ends ensure high rigidity with the lowest weight. Pistons are from Cosworth and utilize a slipper skirt design for low frictional losses and an advanced boxed bridge forging for high rigidity and minimal weight.

Every short block is professionally assembled in our dedicted engine building room by our in-house builder who has 18 years of motorsport level Subaru engine experience and has built hundreds of Subaru high performance engines. Every short block is blueprinted to carefully designed specifications that balance extended service life with extreme power capabilities. Every dimension is logged and a build spec sheet is provided for reference. The block is assembled with all necessary block hardware and oil separator plate.

NOTE: The Street Spec Value and Standard versions have been unified into this single new specification. Available in both standard and high compression versions. This shortblock comes with a 3 month limited warranty against defects in materials or crafstmanship.

Click here for shortblock comparison chart.

Usually ships in 2 to 3 days.

Manufacturer: RalliSpec

Applications:

  • Subaru WRX STI MY15-18
  • Subaru Impreza STI MY01-14
  • Subaru Impreza WRX MY06-14
  • Subaru Legacy GT MY05-12
  • Subaru Outback XT MY05-09
  • Subaru Forester XT MY04-13
Part No. Description Displacement Price Ea. Add to Cart
RSB-SS25 RalliSpec Street Spec Standard Shortblock 8.2:1 (8.6:1 EJ255 D25 Head) 2.5L $3450.00
RSB-SS25HC RalliSpec Street Spec Standard Shortblock 9.4:1 (9.9:1 EJ255 D25 Head) 2.5L $3450.00