Crawford Performance built and developed the engines that powered Ken Block's Gymkhana STIs — the same cars that put Subaru motorsport on the map. Ken Block didn't just use Crawford engines, he helped develop them. The KB Spec long block is that exact build, available for your car.

Engineered with CrawfordSPEC billet pistons, forged rods, KB-Spec cylinder heads, and a balanced rotating assembly. Rated 700+ WHP. Brand new — no core required.

Specs

• CrawfordSPEC FSR billet pistons — CNC-machined 2618-T6 forged aluminum, internal & external bracing, up to 32g lighter than traditional forgings
• CrawfordSPEC forged rods — billet 4340 chrome-moly, optimized length for improved rod ratio and high-RPM cylinder pressure
• Upgraded performance bearings — race-proven, built for long-term high-horsepower use
• KB-Spec cylinder heads — port & polished, multi-angle valve job, increased airflow, throttle response, and RPM stability
• KB-Spec assembly — file-fit ring gaps, balanced rotating assembly
• Fully blueprinted within OEM specs
• Brand new — no core fee
• 1-year unlimited mileage performance warranty

Built for

• WRX STI builds targeting 600–700+ WHP
• Time attack, track day, rally, and Gymkhana-inspired builds
• Trusted by Ken Block, Travis Pastrana, and Subaru of America motorsport programs

Built to order. Call to confirm inventory and lead times.