... Engines:Engine pistons,valves,valve seats,valve guides,ignition systems,high voltage cables,spark plugs and etc. are especially ... by engine configuration2Valves & valve seatsSpecial material and special treatment to valves & valve seats for a longer life.Important ... to 6.87 liters, engine models include Isuzu 4JA1, 4JB1 and some Chinese gas engines)Engine pistons, valves, valve seats, ignition systems ...