How to Install & Tune a Mighty Demon 750 Double Pumper 4 Barrel Carburetor

How to install & tune a Mighty Demon 750 double pumper 4 barrel carburetor with mechanical secondaries. Same will apply to 4150 style Holley carburetors. 1st thing is to make sure your engine is mechanically sound and ignition timing is correct. I run mine at 40 degrees total. A new carb will not bandaid existing problems. I cover: Setting float level. Replacing main jets. Installing accelerator pump nozzles. (Normally if you have a stumble or hesitation going from idle to wide open throttle quickly it's because the accelerator pump nozzles are too small. Go up a few sizes and see if that helps.) Adjusting idle mixture screws. Fuel inlet line is a Demon Carburetion small flange-style inlet kit -6AN 3/8" hose system. GoPro Hero 11 Mini footage.

My tune up:

--Primary main jets: 79
--Secondary main jets: 85
--Accelerator pump nozzles front and rear: 0.040"
--Air mixture screws: 2 out on all 4 corners
--Idle feed restriction: 35
--High speed air bleeds: 36
--Primary power valve: 4.5
--Primary & secondary accelerator pump cams: Pink
--Boosters: Down leg


Notes:

—Float bowl screw torque is 50 in.-lbs.
—Carburetor base to intake manifold torque is 80 in.-lbs.
--Running float levels too high will cause flooding and hard starting
--Car is is '69 Camaro
--Engine is a 10.75:1 compression, pump gas 383 stroker small block Chevy with 195cc Airflow Research Eliminator aluminum fully CNC ported heads
--Comp Cams Xtreme Energy 294H hydraulic flat tappet cam
—Pete Jackson noisy gear drive
--Simmit 1.5 roller rockers
--Edelbrock Victor Jr. single plane intake manifold
--Hooker Super Competition 1 3/4" headers
--MSD Digital 6 ignition, Blaster 2 coil, Pro Billet distributor
--125 shot NOS Powershot plate nitrous system
--TCI reverse pattern manual valve body TH400
--TCI Super Streetfighter 3,500 stall nitrous converter with balloon plate
--12 bolt with 4.10s
—Carburetor stand is an IBT 4150 from ebay
--This is the second Demon carburetor I bought that the Idle Eze was stuck. I bent a screwdriver blade trying to open it so I left it shut. My combination runs better anyways with the Idle-Eze fully closed.