318 MAX fuel economy builds?

mgoblue9798 said

And that is the tradeoff. But those that are looking for fuel efficiency aren't turning their v8 engines to 5k rpms.

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That was sarcasm.......The reason I posted that article is that that manifold is claimed to be too small to support any sort of power by the usual an engine is just an air pomp crowd but was only 17 hp down at maximum air flow demand. Vacuum is what vaporizes fuel so you can actually use it so if a so called "restrictive" manifold can improve vaporization then your making more power because you're actually burning more of the fuel.

There's a big difference between quantity of mixture and quality of mixture. Just because your carb meters a hypothetically correct AFR of 14.7 doesn't mean that's what the cylinder actually sees at ignition time.