Ford Gen 1 3.5 litre V6 Ecoboost. High performance progressively wound PACALOYtm beehive valve spring and Titanium Retainer Kit. 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.