Pro Dual Valve Spring Set(24) 5VZ Use For Naturally Aspirated Or Low Boost Applications 0 Pro Dual Valve Springs (Naturally Aspirated / Low Boost) The Pro Dual Valve Springs are a "must-have" upgrade when running bigger lift cams and higher RPM's. With 75lbs of seat pressure at a 1.400"... $257.45 Quick view add to cart Add Wish List add to cart