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The KB Performance Piston Kit is engineered for high-performance engine builds, featuring a 4.250-inch standard bore designed to fit 4.250-inch cylinders. Crafted with precision, this kit provides an 11.8:1 compression ratio, enhancing horsepower and torque for demanding applications. The pistons are constructed with a Type 3 hard-anodized crown, offering excellent corrosion resistance, especially beneficial when using alcohol-added fuels. The crown design ensures durability and maintains performance under high-stress conditions, extending the lifespan of the piston assembly. The valve pockets are engineered to accept up to +4.00 mm oversized intake and exhaust valves, providing flexibility for performance upgrades and customizations. The piston kit includes pistons, rings, wrist pins, and locks, making it a comprehensive solution for engine rebuilds or performance upgrades. The heavy-duty wrist pins have a precise 0.9270-inch diameter, ensuring a proper fit with the connecting rods, which is critical for maintaining engine integrity during high RPM operation. The Type 3 hard-anodized top ring groove prevents micro-welding of the ring to the groove and provides a hard, flat surface for ring rotation, reducing wear and enhancing sealing capabilities. The OE-style round wire locks facilitate easy installation, streamlining the assembly process. The Line2Line AST skirt coating starts with near-zero wall clearance, which, combined with a controlled break-in period, allows the cylinders to hone to the pistons, creating the ideal oil wedge. This process helps keep the piston square within the cylinder, resulting in optimal ring seal and quieter engine operation. Designed for 4.250-inch bore cylinders (sold separately), this kit offers a reliable upgrade for engines requiring a 124 cubic inch displacement with a compression ratio suited for high-performance driving. Whether for racing or street performance, this piston kit provides durability, efficiency, and consistent power delivery for your engine build.
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