Pro HD Dual Valve Spring Set(24) 5VZ Use For High RPM/Boost Applications 0 Pro HD Dual Valve Springs (High RPM / Boost) The Pro Dual Valve Springs are a "must-have" upgrade when running bigger lift cams and higher RPM's. With 100lbs of seat pressure 1.400" install height... $374.87 Quick view add to cart Add Wish List add to cart