Does anyone have real world, back to back, testing results of adding an air pan to seal the carb to the hood? I'm in the process of building one for my Road Runner, and wondering if it will actually pick the car up some?

Jeff...There was a thread quite some time ago about air pans. I do believe there was results posted. Did you try a search in the race forum?

I did. Couldn't find any results. Might have been more than 2 years ago.

Vs nothing?
Can't imagine there is ever a downside with a air pan with a scoop as pictured.
However, depending on height available under the scoop, seems any velocity stack, even very short would-be a plus with an air pan.
I would think the biggest unknown would be what effects any wind shear across the carb might be at play regarding scoop inlet air velocity vs internal scoop volume past/downwind of the carb inlet.

edit, but with a pan that big nearly extending out over the headers, I'd be inclined to take some preventive measures to prevent generating another large heat source from radiating? more heat into inlet air.

Yeah...It probably was longer than two years...

I consistently picked up a tenth and 1-1/2 mph on my A12 running in Stock Eliminator and SS when running the factory baseplate.

I used to have a six pack hood on my cuda years ago. Sealing it to the carb was worth a tenth and 1.5 mph, but that was on a mid to low 11 sec combo. There's a lot more air flow across it at low 9 sec speed! Won't know until you try it, but I'd bet it helps.
Then this tidbit...the 5" cowl hood that's currently on the car matched the other hood's best ET and MPH...and the cowl wasn't sealed to the carb.

We went from this unsealed scoop


To this


No change, we didn't pick up a thing. A/Fr's were the same too

Couple of years ago I did an A B A test. At the time I hadn't run a jetting loop so it was somewhat lean. With the pan was worth .05@2 mph.
Doug

Tig...the lexan scoop looks better even if it isn't worth any power.

Much slower car than OP's, but open T/A Challenger scoop to sealed was a solid .1+ and 1+ MPH improvement

x2

We tested my air pan setup when my current 410 c.i. small block was on the dyno a few months ago . Weather wasn’t optimum for testing and it was’ t an actual sealed to hood test . We made pulls without the setup ( open carb , no air cleaner ) and with my filter / air pan .. the results were : No loss or gain in horsepower or torque with the air pan or without . I am sure there is a gain when in the car especially in cooler air . It is good to know however that my setup isn’t hurting my performance , I like having the air cleaner especially at dusty tracks.

I don't remember the et or mph difference on my Dart with and without the air pan. It is slower with it off and the afr's are all over the place, not just at high speed but everywhere, it seems unhappy the entire run. I did A-B-A tests, and the results were the same each time. I run a belt drive fan so that may have something to do with the afr's at lower speeds.

During my “oh S where’s my hoodpins” experiment there was no negligible et difference running without my hood. I do run the UNI air filter to keep out rocks.

Worth mentioning - if you search the subjects you want in google, a bunch of old Moparts and yellowbullet threads will show up, it works surprisingly well, I've found some valuable info from a decade ago that way.

I haven't sealed my scoop yet but I was surprised to see that removing my air filter completely lost 0.1 in ET and 1 mph back to back at GLD. Am definitely going to be making some type of air pan in the future.

I did do the google search, and came up with a thread from 2011. It was a 50/50 yes it worked, no it didn't work thread...

I have 2 cars. A 67 Barracuda, and a 70 Duster that picked up over a tenth in the 1/8 mile when we sealed the 440 6 pack scoops up to the hood.

The Barracuda was good for 1.5 tenths in the 1/4.

The day I tested this on our Duster it went 6.76 without, 6.66 with and 6.76 without.

One of the race cars that I tune is a COPO Camaro. We've run it multiple times with and without the scoop hooked up to the throttle body and the difference is 2 tenths. Runs 9 tens with the air pan, 9 thirtys without the pan.
https://youtu.be/oHcrXo0P6aY