Supertech Honda K Series 87mm 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 looking to significantly increase compression for improved performance, these Supertech forged pistons are a solid choice. Designed for an 87mm bore, they feature a +11.4cc dome volume, which helps achieve a 12.5:1 compression ratio when paired with the right cylinder head and gasket combination. This higher compression ratio is key for extracting more power and torque from your K20 or K24 engine, especially when you're aiming for naturally aspirated builds or forced induction setups that benefit from increased cylinder pressure.

These pistons are forged from high-strength aluminum alloy, a common practice for performance engine components because it offers a strong yet relatively lightweight solution. Forging creates a more dense and durable grain structure compared to cast pistons, making them better able to withstand the higher stresses and temperatures associated with increased compression and performance tuning. This set includes four pistons, but please note that piston rings are sold separately, so be sure to factor that into your build plan. The specific dome shape is engineered to work with K-series cylinder heads to achieve the target compression ratio, and they are designed to fit right into an 87mm bore block.

When undertaking a performance engine build, attention to detail is crucial. These Supertech pistons are a significant upgrade over stock components, offering the durability and performance characteristics needed for demanding applications. Remember that achieving the advertised 12.5:1 compression ratio depends on the specific cylinder head volume, head gasket thickness, and deck height of your engine. It's always recommended to consult with your engine builder or a performance specialist to ensure these pistons integrate correctly into your overall build strategy.