Cylinder Heads, Valves, Springs & Parts (C.V. Aftermarket) Distribution World Summary: Market Values & Financials by Country (PureData World Summary Book 4151)
Norgren
Norgren V60A513A-A213L, In-line Valve, N/A, G1/8, 750l/min, Electropneumatic; magnet/air spring
Comp Cams
Competition Cams 980-16 Single Valve Spring
Dynamic and Fatigue Assessment of Heavy-Duty Engine Valves (Mechanics and Adaptronics)