... ~800°C, intake valve 300~500°CEngine valve head with customer logoEngine valve pole platingEngine valve treatment nitriding, hard surfacingEngine valve use thermostability, stand wear ... systemChain, sprocket, bearing, wheel, tires, rims, and others.Engine partsCylinder block, cylinder head, crankshaft, camshaft, piston, piston ring, magneto, clutch, paper ...