... pistons,valves,valve seats,valve guides,ignition systems,high voltage cables,spark plugs and etc. are especially designed and ... system.·Install CNG/LPG kit Engine Model List for Diesel-to-Gas Conversion Kits (Retrofitting) Engine MakeEngine ModelEngine ModelNGV / CNG ( ... engines)Engine pistons, valves, valve seats, ignition systems, high voltage cables, spark plugs and etc. are specially designed and/ ...