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Well I figured an engine builder would get into the weeds some. And would know all the little tricks the layperson wouldn't, when it comes to the engine itself. He said lower rotational mass isn't worth enough to go chasing it down, and to focus efforts elsewhere. Because you'd spend $3,500 or more just the gain 0.3% fuel economy. Not even a full 1%
Still be fun for me to try if money was no object, but that ain't the case so yeah I'll just do what he says.
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