MichaelT1960,

I can be fairly certian they didn't pick excessive tolerance parts. In case you haven't checked out the service manual, bearings come in A, B, C, and D...well maybe not exactly but it's been awhile, but they are coded per tolerance. In anycase this same attention to detial is even shown at the engine plant. Each block and mating crank/cam have the tolerances computer checked then the computer hand picks which bearings should go in each slot. It's unlikely to be a slipped rod bearing from poor assembly.

In anycase I find it hard to believe you could put thousands of miles on a bad bearing, you would start to find oil shavings in the filter and crank case at some point.

You could always change the oil and have the filter analyzed to see if you have a high degree of metal shavings from bearing failure, etc.

Have you had a new water pump or timing belt tensioner installed with a new timing belt...a bad set of either could lead to a bad rattle.