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I am sitting right at the 650 level with the Whipple and LT4 fueling @ 9psi boost. All of my fueling logs, fuel rail pressure, pulse width, AFR, etc. are all withing the safe zones. My tuner says my engine should see a long and happy life at the current levels. It seems to be less about an absolute HP number, instead how you get to the HP number. The higher your boost level and the more you push your fueling to the limit the higher probability you will have a problem. The wildcard is some engines don't have the same tolerance so even if you follow all the best practices you could still have a problem.
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