Brian Crower Subaru EJ257 STI Stroker Kit - 83mm Billet Crank/ProH625+ Rods (5.141in) Custom Pistons

This is the Brian Crower EJ257 STI Stroker Kit, specifically designed for the 2004-2014 Subaru Impreza and the 2015-2017 WRX STI. If you're looking to significantly increase the displacement and potential power output of your EJ257 engine, this kit is a well-built foundation for that build. It includes an 83mm billet crankshaft, a set of Brian Crower's ProH625+ connecting rods with a length of 5.141 inches, and custom-designed pistons to match the new stroke and bore size.

The heart of this kit is the 83mm billet crankshaft. Billet construction means it's machined from a solid block of steel, making it incredibly strong and resistant to flexing under high loads, which is crucial for boosted applications. This larger stroke, combined with the custom pistons, raises the engine's displacement, allowing for more air and fuel to be consumed, which directly translates to increased torque and horsepower potential. The ProH625+ connecting rods are also a strong choice, featuring H11 tool steel bolts known for their durability and ability to handle significant stress. These components are engineered to work together seamlessly, ensuring proper engine geometry and reliable operation.

When undertaking a stroker build like this, it's important to plan for supporting modifications. This kit is intended for engines that will be rebuilt from the ground up, requiring careful attention to balancing, machining, and assembly. You'll also want to consider upgrades to your fuel system, engine management, and cooling system to take full advantage of the increased displacement and power. This Brian Crower stroker kit is a popular choice for Subaru enthusiasts looking to build a serious performance engine.