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I have felt the reason that the LT1 goes boom is more related to lack of octane than ring bind. All the pics of the tear downs thus far have not shown that the rings are binding in the cylinders.
It wouldn't surprise me that the meth kits are another reason. The manifold was designed to be "dry" and making it "wet" causes distribution problems (i.e. lean cylinders).
And yes, forged pistons do expand/contract more than hypereutectic pistons.
This one of the reasons OEM's use them. Less gap = less emissions and better MPG.
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