3.5 Ecoboost V6 Beehive Valve Springs. High performance, progressively wound PACALOY??? beehive valve spring with titanium retainers. This kit was engineered to match our camshafts for ultimate quality, performance and reliability. 90lb seat pressure @ 36.5mm Installed height / 193lb @ 11mm lift / Coil bind is at 23.6mm.