Will Chinese bearings last?  Most likely you will never have any problems.....as long as you have the proper spacers on the axle.

Very few Savages actually wear out from proper use - most problems are associated with neglect, stale old fuel, chain tensioner failure, petcock failure, lack of oil or too low idle speed, cam/rocker damage from improper oil with low ZDDP levels or friction modifiers that cause clutch slippage , or corrosion from being stored outside.