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I was recently talking with a engine reco-er.
He sugestered gen jap inserts are basically up to the task of lpg, but need to be inspected of course, even the valves are pretty reliable,
problems...

No mate it was unsolicited as I was extremely happy with the reconditioned Head

Try this mate. It is where I got my Head for a 4.5 . Very Happy

http://www.cavehillengines.com.au/

Sounds to me that the engine is just tired and in need of a freshen up. Rings, head and what ever else is worn. The story you were told sounds like bs.