If the HE stands for “High Efficiency” surely isn the HE V12 the best starting point for a high power V12 engine?

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If the HE stands for “High Efficiency” surely isn the HE V12 the best starting point for a high power V12 engine?

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No. The “High Efficiency” label refers to part throttle fuel efficiency where the HE was a major advance over the pre-HE flat head engine. The pocketed exhaust valves are a major limitation on the power potential of the HE engine.

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