VSR Series (VALVE SPRINGS REQUIRED) FORD 4.6L & 5.4L MODULAR 3V CAMS

XFI VSR (Valve Springs Required) Cam Sets for Ford 4.6L & 5.4L Modular 3 Valve Engines. Designed for those hardcore enthusiasts looking to achieve substantial horsepower and torque increases and who aren't intimidated by having to upgrade their valve springs. Available for both naturally aspirated and supercharged engines, these cam sets are also available in two stages. Designed to work with the Ford variable cam timing (VCT) system, these camshaft sets are direct replacements that bolt in without engine modification except the valve spring upgrade. By working with the VCT, which is programmed to retard the camshaft timing at peak power, COMP Cams XFI VSR Cam Sets for Ford 4.6L & 5.4L Modular 3 Valve Engines optimize both mid-range and high rpm performance. Net power increases up to and as much as 35 +HP increases over stock levels.