Where they are this nos ? You mean VIN ?DJB: what year and engine you have? Is your engine's code 5th character D or F?
My LPG system is not setup for adding any gasoline at any RPMs. I've checked valve clearance prior LPG conversion at 213kkm and most of exhaust valves had nominal clearance (0.35mm) and 3 valve were at minimal tolerance (0.30mm). This engine never got any valve adjustment job done before, so it looked pretty good. I will make 40-50kkm and if any other bad symptoms will occur before that I will measure valve clearance again, than I will know what damage to the valves makes LPG.