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<blockquote data-quote="Catmonkey" data-source="post: 16642966" data-attributes="member: 124025"><p>Safe level is 550. Most failures are the result of pushing it over the 6,500 rpm redline. The engines have long strokes and pistons speeds are quite high. Increasing rpm just exacerbates the speed. There's nothing wrong with the block, it's the OEM rods that are the weak link. These engine have proven to be pretty durable in stock form, but no one can guarantee that you won't break a rod even at your current power level. A good tuner can improve your odds and staying conservative with the tune can't hurt either. E85 will need bigger injectors. A return style fuel pump is the only option if your at max duty cycle on the fuel pumps. Making more power on E85 will not improve your odds for longevity, but it will decrease your chances of detonation. These engines are insanely expensive to build. If you have an engine failure, you're almost sure to lose the block and aluminum blocks are getting a little harder to find.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16642966, member: 124025"] Safe level is 550. Most failures are the result of pushing it over the 6,500 rpm redline. The engines have long strokes and pistons speeds are quite high. Increasing rpm just exacerbates the speed. There's nothing wrong with the block, it's the OEM rods that are the weak link. These engine have proven to be pretty durable in stock form, but no one can guarantee that you won't break a rod even at your current power level. A good tuner can improve your odds and staying conservative with the tune can't hurt either. E85 will need bigger injectors. A return style fuel pump is the only option if your at max duty cycle on the fuel pumps. Making more power on E85 will not improve your odds for longevity, but it will decrease your chances of detonation. These engines are insanely expensive to build. If you have an engine failure, you're almost sure to lose the block and aluminum blocks are getting a little harder to find. [/QUOTE]
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