The 6000 Series Competition Valves are designed to provide excellent reliability in an environment of high spring pressures and roller cams, at a budget price. They have higher fatigue resistance and tensile strengths than our competitor's best offerings. These valves can be used in Drag and Oval Track racing applications. To manufacture the valves Ferrea uses an exclusive two-step slow forging process using EV8 stainless steel on both intake and exhaust valves. They provide a special heat-treatment and stress relieving process, along with hard chrome stems and friction-welded hard tips. Ferrea finishes with a swirl polished head. The valves feature flow improvements to deliver the power needed for today's sophisticated racing enginesPit Stop USA offers Ferrea 6000 Series Competition Exhaust Valve - Ford 351W & GT40 - 1.600", 11/32" Stem Diameter, 5.075" Overall Length - (Set of 8) F6183-8 at low everyday prices. Be sure to check out all of our products from Ferrea Racing Components including Ferrea Racing Components 6000 Series Competition Valves.