Hi,
I came across this thread some months ago, and having suffered the disastrous effects of a broken exhaust valve in my NF and the need to repair the damage to the engine, making some improvements along the way seem to be a good idea. Could you just confirm that with the cylinder head modification you describe a standard (flat-topped) piston is run in the engine? Any advice on the pistons to use? By the way, could you tell me the make of the valves you used?
Sigean