I read when Hot VWs was building their "Mileage Motor," they were seeking to add rotating weight. I don't know why they would do that, but they were dead set on doing it, and they were in the mid-30s at 65mph on an otherwise stock VW when they were done. So maybe you don't need to search for the lightest weight on all your internals.
If anybody knows the rationale behind doing this, please elucidate. I'd love to know what they're on about, and why it worked.
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