Stock bottom end will hold 500whp no problem, but if your are a high mileage person you should expect problems sooner than later. Duane (UpgradedSupra) has been running 30psi and 650+whp for a while without issue. He has a mhg and shot peened rods, that's it!! If you were to rebuild the motor with new rods, proper sized bearings and pistons it would hold 500whp all day long. Stock ct26 is good to around 14psi, higher it starts to lose efficiency so I've read. An upgraded wheel in a ct26 will get you in the 400whp range with supporting mods.
Not easy to answer as everyones engine has been beat in a different way. If you arent rebuilt you can expect to do it soon if you push it. 120k is getting up there on an original engine.
hopefully this comes close to what you're looking for.
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Nate
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