At what point in the performance modification process should the EVO owner think about increasing the durability? For any standard engine this would be the 35% marker--but from what I understand these engines already contain forged pistons and/or rods?

So at what HP number do most of the pro tuners go about getting a better grade of internals? What stroker kits are said to be the most durable?

 

Easily searched on both accounts

According to AMS the stock block should be good up to the 500hp mark.

Strokers may not be the best option for durability I'd highly recommend waiting until AMS finishes off their release on the new 23RR block with a different rod stroke ratio than your typical 2.3L. Information on this setup can be found under the automotorsports section of the forum under vendors or in the turbo/drivetrain section.

If your set on the stroker for low end torque look into one of the top builders kits like Buschur or AMS. The increase in piston speed is bound to kill some of your durability despite any components used. I'm sure there are other kits that will do just as well such as maybe JUN's 2.2L or Costworth's. But i'm just stating some of the most famous brands here.