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Prepare to pay to play if you want things to last. Pushing on stock block pistons id say 300whp max is reliable/safe long term if engine is healthy to start with; past that you better rebuild the block and throw in forged pistons,metal headgasket,bearings
Il have an s13 sr20det redtop engine i built in 2009 thats been through 70000km tuned at a very modest 350whp at 17 psi and is as healthy today as when it got built 8 years ago. It gets daily driven, some circuit and beaten regularly compression and leak downs are perfect. Mahle 86.5 pistons,eagle rods, all arp studs,apex headgasket and royal purple oil
Good maintenance,lubes and products make a huge difference in the equation
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