>10 psi boost and a stock LS3 is Russian Roulette. Already a mismatch Solid boost and a factory GM tolerances good NA engine, but not built by GM for boost. If you've got a Colt or Webley 6 shooter throw a bullet/round in, pull the trigger odds are published online especially, you might just be fine. Probability states you will mostly be fine....The internet posts all the success "my stock LS held boost turbo Supercharged, Centrifugal, or Positive displacement". Low boost stock NA engines win. At low boost high gain low risk. That's not gambling. It's not gambling with LS1s and LS truck motors (many are iron) when the junkyard has dime a dozen replacements. High boost blow up, junkyard hand over small change, even fun.
A used LS3 costs a bit more like real money still. For a while. The last Commodore is becoming a junkyard car in Australia already, but they are charging...
When it's my wallet >10psi boost LS3 you're now a casino high roller. Take a whole engine approach, whole LSA, whole LS9, whole LT4. Or build it, that means check it yourself, trust your builder/machinist and forged parts supplier = stress.
Forums and e-knowledge is still useful valid https://www.lsxmag.com/tech-stories/...urviving-boost
almost 9 year old article. Close to a decade later it might still be only mostly right. Cue posting exceptions....Probability can be cruel when you pull the trigger at >10psi boost
In laconic Aussie speak there are Wednesday and Friday engines. Ironically in LS3s A Wednesday engine may have perfect tight ring gaps that close with heat and high cylinder pressure >10psi, and a bad Monday or Friday engine, or even an abused engine loose enough to handle >10psi boost....heat and cylinder pressure.
As I'm planning over 10 psi I'm worried regarding - the nodular cast LS3 crank over forged crank, H beam rods over premium I beam, may be false economy. Plenty of stress comes with the tuner offering to turn up the boost, timing, injectors and fuel system. Or do you as in Kenny Roger's "know when to walk away or when to run" at a HP Limit.