| whoever is stating this and telling others is sending out wrong information. If crankshaft is balanced properly and utilizing a harmonic damper (ATI) there are NO issues with harmonics ruining bearnigs. Bearings are ruined primarily for oiling and detonation issues. If bearings are being beat out of a block due to harmonics then there is a serious imbalance wth the crankshaft that needs to be dealt with. VG30 assemblies can and have been taken to 9000+rpm consistantly. Its all in the setup and well balanced rotating assemblies. My last Z32 revved to 9200 without any issues and never had any bearing failure due to harmonics. As for a rev limit for a stock short block. I wouldn't take it much past 7K due to the rotating weight you are moving. Stock rods and pistons are significantly heavier than their forged counterparts. If you want to reduce harmonic frequency I would suggest installing an ATI damper on your stock assembly. This will yield you to have a safer rev limit. Ulitimately however, your cylinder head and valve train components are the redline in the sand in terms of capability of the engines RPM production.
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