Islander Jock,
Just seen your latest post. 100 hrs is justifiable for warranty, providing that 100 hrs hasn't taken 5 years to clock up. I have seen camshafts that have failed inspection after 700 hrs, but not 100 hrs. If your engine was reassembled by an approved organisation (i.e. Part 145) who purchased the items either direct or through the local Lycoming agent, then I feel you have straightforward grounds for a warranty claim, including the labour. If it was done another way, you may have difficulty.
As westafricaops says, the Ney Nozzle modification, which is one of the STC's I was refering to earlier, works.
camlobe