Funny you say that, naturally aspirated engines put more stress on rod bolts and rods.

Honda engineers also test their engines extensively, but only for what they are designed for. The B20/18 motors wern't designed to see 8000rpm onwards, they may be able to handle it no problem, they may not, nobody here obviously knows enough to put some hard fast facts down and Honda more than likely didn't test for it either. I personally think that standard rod bolts will be fine in stockish cam configurations.