some interesting points re Titanium, My experience from Valves, And Found we had a few failures on the Dy no, bedding brand new stuff, and Failures were during warm up and idles, later found that some solvent have an adverse affect on titanium,
this is from my drag racing days, titanium valves have never melted, when lean outs have accrued melted pistons , ie a fuel supply line gets skwished during reassembley and leans a cylinder out,
good set of pistons will run at .002 but titanium must b . 0002