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I would not recommend over 650 to 700rwhp. I have a buddy that had a 76mm turbo on a termi engine and it was making over 800rwhp. The rods were starting to fail at that level and started to blue in the middle of the rod from stress. You
 

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Usually about 700 is the limit.
I know of a handful that run 700 daily with tunes and pulley swaps for 800-850 when they want to go play. They haven't had any issues, but I've also seen motors give up at 600. It just depends how lucky you are if you want to push it.
HPP built a twin turbo factory motor that pushed 1100 rwhp, but it decided to try to bend every single connecting rod a few weeks later.
 
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