Supertech Honda K Series 86.50mm Bore +11.4cc Dome 12.5:1 CR Pistons - Set of 4 (Excl Rings)

If you're rebuilding the top end of your Honda K-series engine and aiming for a significant bump in compression, these Supertech 86.50mm bore pistons are a solid choice. Designed for a 12.5:1 compression ratio with their +11.4cc dome volume, they're built to handle increased performance demands. This set includes four pistons, ready to be installed in your K-series block.

These pistons are forged from high-strength aluminum, a common practice for performance engine components because it offers a strong yet lightweight material. Forging creates a denser, more durable piston structure compared to cast aluminum, making them more resistant to the stresses of higher cylinder pressures and temperatures. The 86.50mm bore size is a common overbore for many K-series applications, allowing for increased displacement and improved airflow. It's important to note that this set does not include piston rings, so you'll need to source those separately to complete the assembly.

When installing these pistons, ensure you follow the manufacturer's recommended clearances and torque specifications. Proper installation is crucial for the longevity and performance of your engine build. Remember that these pistons are not CARB approved and cannot be shipped to California. Always consult your engine builder or a qualified mechanic for specific installation advice and to ensure compatibility with your particular K-series engine variant.