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Honestly?
5 or <6L displacement is the worst for a NA racing engine. Too small to work as a dyno, and because of that it needs to rev higher to achieve target power, so consumes can't be optimized.
Considering that in 2010-2011 seasons the judd 5.5 that powered lola rebellion, dyson and oreca 01 had a revlimit to 7500rpm to push 600hp, how much high has to rev now to reach >700? 9000rpm?
almost the same of a sprint cup engine figures.
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