Max Effort 1.437 Dual Valve Springs Howards Cams competition racing valve springs are CNC coiled and heat-treated in the finest facilities available. Using only the highest quality valve spring wire, all Howards valve springs are stress relieved, ground and shot-peened to offer our customers some of the very best valve springs on the market. Whether you’re running a flat tappet or roller cam in your drag race, circle track, road course, performance marine or other extreme race application, Howards offers the perfect valve spring to suit your needs.