BOURNE HPP K-SERIES VALVE SPRING SET N/AThis Bourne HPP valve spring set is designed for N A builds and will handle between 200 350 bhp (N A). The spring set is designed for standard fitment using original platform shims and retainer setups. The valve spring diameter is the same as original Honda Type r valve springs so you can upgrade the valve springs without changing the spring bases or retainers. A fantastic upgrade used to run most aftermarket camshafts with max lift 14mm or less. We