BMW GEN1 B58 Valve Springs. B58 Engine – 3.0L inline 6. High performance, progressively wound PACALOY beehive valve spring with titanium retainers. This kit was specifically engineered to match Kelford’s 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