The bolts used on the Eagle rods are very crappy. I would definitely upgrade them. On the 4 strokes of the engine the weakest link on the rod isn't the rod itself. Its the bolts.
On the compression stroke, the cylinder pressure is holding the upper half of the rod onto the crank while the bolts are holding the cap onto the rod.
On the power stroke, the explosion pressure is holding the rod onto the crank while the bolts are holding the cap on. (really here the bolts really aren't ven doing anything because the rotational inertia is holding the cap as well.)
On the exhaust stroke, the rotational inertia of the crank is used to excavate the spent gasses. The rod is forced upwards in the cylinder and the bolts are holding the cap on.
On the intake stroke, there is a lot of vacuum atop the piston and crancase pressure below. The difference is enough to put a lot of stress on the lower end. Even having the lightest stuff can't help you that much since the pressure change is the bigger problem. Adding a scavenging pump to the crankcase can help reduce this significantly. But most importantly, as the crank continues to spin the rod bolts (only two of them) play an extremely important role in keeping the engine together. If they come apart here the cap will fall off and the next spin (we are talking micro secs here) the rod will jamb in the side of the block and the complete mass goes to shit. All your work is ruined not even the crank can be saved. RPMs can play a very important role here so can rod ratio since the lower the rod ratio the higher the piston speed and the rod angle so if you are planning on spinning the engine a lot of revs simply bite the bullet and buy the expensive stuff.
HKS,greddy,carillo, saenz, pauter are the tops of my list and don't forget the pistons either most off the shelf forged pistons are still cast on the underside (I don't understand why the hell they call it forged. This is probably the reason to purchase the Powerhouse JE pistons rather than the shelf JE pistons)
I hope this information help you decide on what will work for your application. BTW, no manufacturer can gaurantee how many revs you can spin. Your research will be your only gaurantee.
Joe.