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dude what makes you think that the second time wasnt detonation?or even pre ignition
1. you have a sark plug thats near disinigrated
2. you have a hole in your piston with a broken wrist pin
3. last rebuild you melted a piston
um whats your setup?I bet this could have been prevented with a wideband and a cheap $300 water/meth injection but again whats your setup you do have some serious heat issues.(detonation/pre ignition is my bet)
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