I dont think we have had a valve go ever on any of the LPG engines but have only done around 200,000 of LPg running on any one engine (taking the total of teh highest millage engine to the 400,000 mark)
We did buy a GLT on petrol that had burnt a valve and had teh head repled on go on to do the same thing not long after!
For info you can not bore the B200 to 2.3
Not sure if flashlube is going to help as burnt valves are caused by lean burning rather than lack of lubrication
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