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Your description is common in a lot of Zs. If you had bad bearing the noise would be noticeable all the time and usually there's no question about what it is. Bearings are on their way to "going out" from the second your engine is started out of the factory and they'll wear all the time. Eventually they have to wear out....but usually your rings wear out first and your engine gets rebuilt for that reason. That time is usually so far down the line that all you ever hear about is when they do spontaneously go bad due to defect or abuse.
rich '91 300ZXTT "Stage 2.5 10psi" 298.5RWHP / 302.5FT-LBS 13.48 @ 105.65
 Z32.org
ghozttz32 = AIM
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