Ask Smithy Xtra converting a Mitsubishi 380 VRX to LPG

Mitsubishi first launched the 380 without an LPG option and the engine didn’t have the hardened valve seats needed for LPG operation, but when later it released the IMPCO vapour-injection system it also released LPG-compatible cylinder heads. Mitsubishi would tell you that engines like yours, without the LPG heads, shouldn’t be converted, but if you talk to people within the LPG industry you would be told that the IMPCO system is working well, without any problem, on engines with the LPG heads and those without. They add that because the valve seats harden naturally over time there is very little chance of having a problem with your engine even though it doesn’t have the LPG heads.