IT'S not recommended that you convert the Jackaroo to LPG because the engine isn't really compatible. Holden had an LPG option available on the Rodeo with the Isuzu V6, but it proved troublesome. It was an Impco air-valve system and had many driveability problems. If you really want to convert to LPG, George Peake, of Victorian Autogas Supplies, recommends you take your car to a cylinder-head specialist and have the heads fitted with hardened valve seats and valves, then find an installer who will fit it with a generic injection system.