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The block was bored from the factory 86mm to 87mm size. An HKS Step 3 2.8L stroker kit was used for the build. The stroker kit, along with its forged internals help aid in improved torque and bottom end response. The HKS setup is ideal for the RB26 engine since we're looking to gain valuable points in the "power under the curve" category. The HKS kit comes with a set of forged pistons, H-beam rods, and billet full counterweight crankshaft to fortify the bottom end.