AG burr finish

That's a great video. I hate to say it....but it only reinforces the shortcomings of the carburetor. That's not to say EFI doesn't suffer from faults, also. My lowly Mazda 3 uses direct cylinder injection...maybe that's the answer.

Then again....the video illustrates how fuel can separate from (or perhaps more accurately never join) the air. The question becomes 'how much does it matter?'.

In a fuel economy race, I think it could be pretty detrimental. Same for a HP-per-pound of fuel race. But does that fuel have a net effect on HP? Not sure. The cylinders only care about the mixture they see, and how well they can burn it. The fuel stuck to the sides of the intake becomes a non-participant, to an extent.

In other words, if the air/fuel mixture that does make it to the cylinder is 'good' then the engine is gonna be happy. We see that in the impressive power and (generally) clean combustion.

It's safe to assume that fuel stuck to the intake walls eventually gets pulled back into the air, molecule by molecule, and into the cylinder. Is it well homogenized or not? The amount of turbulence we see would suggest that the fuel at least has a chance to be shaken and not stirred before it goes into the cylinder.

I agree on the epoxy comment above...no way would I use epoxy unless my back was against the wall.