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Most engine builders will tell you that "IF" you race prep the stock rods they are good to 400-450hp. That means stress relieve, magniflux...... Anything over that and Sunbelt, Top End.. Malvern will all say go to aftermarket rods.
There are a few tricks the engine builders are using on the bearings to aid in better oil flow, they are adding a second and or a third groove to aid in oil retention around the bearing. Both Chris May and I were victums of stock bearing replacements and had failures.
The KA crank will hold a lot of power but everything else needs to be right too! I set my top hp bar at 400 and see little need to go higher for a daily driver. I have 5K miles on my Stage III engine and it is performing flawlessly.
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