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I'm not an expert, but as a "rule of thumb" stock cast pistons are limited to around 5 lbs boost if the tune is perfect.



That would depend on the piston of course.

I'm told the 5.7 hemi pistons are not much good beyond 5-7 psi without breaking due to the thin ring packs but other pistons will take as much as 30.

All depends on the engine, lots of Dakota guys running 10 psi+ on stock slugs.