I would have to look on the S&W forum to be sure, but I'm pretty sure the timing was controlled by the extractor that was fitted to my 642 which I swapped over.
I measured the cylinder gap with feeler gauges and it was as small or smaller than my original cylinder.
As I said before, I had it in the gun for 3 years, shot about 80 round with no issues.
I don't want to hijack this thread, but if you Google "install titanium cylinder in J frame" or something like that, you should find the correct threads on the S&W forum easy enough.
Edited to add: TC2, PM sent.
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