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Designed for high-performance applications, the KB Performance Piston Kit features pistons engineered for a 4.250-inch bore with a precise +0.005-inch oversized fit, ideal for 124 cubic inch big block engines. The kit includes pistons, rings, wrist pins, and locks, providing everything needed for a comprehensive rebuild or upgrade. Built with durability and performance in mind, these pistons are compatible with engines requiring a 4.250-inch bore cylinder, which is sold separately. The design ensures a reliable fit and optimized combustion efficiency, delivering increased power and engine responsiveness.
The piston crown is Type 3 hard-anodized, offering excellent corrosion resistance especially suitable for alcohol-added fuels, which can be more corrosive than traditional gasoline. Valve pockets are designed to accept up to +4.00 mm oversized intake and exhaust valves, accommodating high-performance valve upgrades. The top ring groove also features Type 3 hard-anodizing, eliminating micro-welding and providing a hard-flat surface that promotes consistent ring rotation and sealing.
OE-style round wire locks are included for ease of installation, ensuring a secure fit for the piston assembly. Heavy-duty wrist pins with a true 0.9270-inch diameter are designed to fit correctly into the connecting rods, providing a robust connection that withstands high-stress conditions. The piston skirt is coated with Line2Line AST, which starts with near-zero wall clearance and hones the cylinders during break-in, creating the ideal oil wedge to keep the piston square within the cylinder. This process enhances ring sealing, reduces noise, and prolongs engine life.
Overall, the KB Performance Piston Kit is engineered for serious enthusiasts and racers seeking reliable performance, durability, and an increase in power output. Whether upgrading an existing engine or building a new high-performance setup, this kit offers the quality and precision required for demanding applications, ensuring optimal operation and longevity for your big block engine.
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