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Well consider that most of the manufacturers are running a single/twin turbo V6, in sizes from sub-3 L to 3.6 L. Then, the fact that both LMH/LMDh chassis had been equalised to a base of 1030 K, with allowed adjustments. This makes it possible for said ICE components to return great power to weight ratios, before addition of hybrid systems are included.
The Meccachrome V6 is a NA-based Formula engine, and all it took is to do the necessary upgrades to handle forced induction for endurance racing. And, as we have seen so far, many engines being built to race at the present rules are based on previous work that have been around since 2016. Just upgraded with more modern management systems.
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