Supertech Honda K Series 86.00mm Bore +8cc Dome 11.5:1 CR Pistons - Set of 4 (Excl Rings)

If you're rebuilding the top end of your Honda K-series engine and looking for a solid bump in compression, these Supertech 86.00mm bore pistons are a well-built option. Designed to achieve an 11.5:1 compression ratio with a +8cc dome volume, they're a popular choice for naturally aspirated builds aiming for more power without forced induction.

These pistons are forged from high-strength aluminum, a common practice for performance engine components because it offers a good balance of durability and weight savings. The 86.00mm bore size is a common overbore for K-series engines, allowing for increased displacement. The +8cc dome shape is specifically designed to work with certain cylinder head volumes to achieve the target 11.5:1 compression ratio, which generally means a more responsive engine with improved throttle response. Keep in mind that these pistons are sold as a set of four and do not include piston rings, so you'll need to source those separately. It's also important to note that these are not CARB approved and cannot be shipped to California.

When installing these, ensure your machine shop is aware of the specific bore size and dome volume for proper cylinder head matching and assembly. Achieving the correct piston-to-valve clearance is critical, especially with a higher compression setup. Always refer to the manufacturer's detailed installation instructions and consult with your engine builder to ensure a successful rebuild.