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Race Spec Pro Shortblock

The Race Spec series short blocks are designed and built for the demands of motorsport. The block is CNC machined and fitted with Darton sleeves. The Race Spec Pro is our top level motorsport short block option and features components of the absolute highest quality. Built using an Arrow lightweight billet crankshaft, King XPG Tri-Metal bearings, Omega 2618 forged pistons, RalliSpec-developed H-beam rods machined from 300M (ultra high strength aerospace alloy) and fitted with ARP Custom Age 625+ bolts, and ARP high tensile block hardware. Assembled from all new parts and fully balanced/blueprinted. Optionally, we have a used block exchange program whereby we build from a good used block and take yours in trade. Available in two compression ratio options.

Click here for shortblock comparison chart.

Usually ships in 3 to 4 weeks.

Manufacturer: RalliSpec


  • Subaru
Part No. Description Displacement Price Ea. Add to Cart
RSB-RS25P RalliSpec Race Spec Pro Shortblock 8.2:1 2.5L $8800.00
RSB-RS25PHC RalliSpec Race Spec Pro Shortblock High Compression 9.4:1 2.5L $8800.00