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If you had hypereutectic pistons shaved, that may be your problem. From the Keith Black website the article on the hyper pistons says they need the polished tops to reflect the heat back into the combustion chamber and reduce the heat going past the top of the piston to the top rings. This is the reason they are recommended with such a close cylinder fit. If you took off the polished tops without polishing again to factory specs, it may have caused heat to travel to the first ring and cause a ring bind or a ring groove failure.
With 393 strokers, be sure to use the right dish piston to keep your compression reasonable. With a "0" deck, you will need approximately 16-20 CC dish on your pistons with 58-60 CC head chambers to maintain around 10 or 10.5 to 1 compression ratio, which should handle pump gas if you're using aluminum heads. This is a little high on compression if you're running cast iron heads.
As Ernie stated above, especially on stroked engines, you need to keep your quench distances as close as you can to get the full efficiency from your engine and to avoid detonation problems.
Bob
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