B58 / S58 Engine – 3.0L inline 6. High performance, progressively wound PACALOY beehive valve spring with titanium retainers. This kit was specifically engineered to match our Stage 1, Stage 2 and Stage 3 Camshafts for ultimate quality, performance and reliability. 90lb seat pressure at 36.5mm installed height. 193lb at 11.0mm valve lift. Spring coil bind height at 23.6mm.