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8500 rpm is only 4612 f/s average piston speed. The stroke is so short (3.256"), and the rods and crank are forged, I don't think 8500 rpm will be a problem at all for the bottom end.
Here's some average piston speed calculations that I made for the 4.0" stroker crank that's going in my LSx on the left. On the right gives you something to compare piston speeds to. Most engine builders say to stay under 5000 fpm for a high quality fully forged bottom end as a rule of thumb.
RPM FPM
7000 4666 LS7 (stock with titanium valves and rods)
7200 4800 Modern F1 (1.6" stroke at 18000 max rpm)
7500 5000 Honda b16 at 9900 rpm
7650 5100 R07 Nascar engine
8200 5466 Tosto Drag machine
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