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I found some really cool new carburetors from Demon Carburetion in my search for the perfect carburetor.
The first is the "Road Demon, Jr." It is basically a Holley 4160 with a smoother intake path and improved boosters. Just like the 4160, it only has a metering block on the primary side.
The next is the "Road Demon(, sr.)" and is basically a Holley 4150 with he same improvements the Jr. has, and has metering blocks on both sides. It shares a throttle body and venturi body with the Jr.
Both carbs are avalible in 525, 625, and 725 CFM variations. The 525 has annular boosters on all four barrels, where the two larger sizes only have annulars on the secondaries; the primaries and down-leg boosters. Sounds a little bass-ackwards to me. They run in the $280-$350 range and certainly appear to be a better deal than a Holley
But the carb that really caught my eye was the "Street Demon". This carb appears to be based on the Carter Thermoquad, but in all reality was custom designed from the baseplate up. It is unique in many ways and has some of the best designs from past carburetors integrated into one. It is a 3-barrel design and the single massive secondary outflows the tiny primaries 2:1. The secondaries are controled by a mechanical progressive linkage and an adjustable air valve just like an Edelbrock Thunder AVS. The primary boosters are not annular, but are a booster within a booster within the main venturi and should atomize the fuel nearly as well as annular boosters do, in addition to increasing vacuum signal. Fuel discharge in the secondary is through two small copper pipes extending into the air path and acting like a spray bar. Primary fuel metering is accomplished through dual stage metering rods that can be replaced without dissasembling the carburetor, just like on an Edelbrock. secondary metering is accomplished through fixed replacable jets. There is even a composite bodied version to keep down the temperature of ethanol fuel. The accelerator pump jets are standard Holley units for precise tuning. The metering rods, primary and secondary main jets, and step-up springs are all replacable. Like a Quadrajet with it's tiny primaries and huge secondary, the only CFM version is 625 but fits an extremely wide variety of engines since the primaries are so small and the air valve prevents over-carburetion. It also features a small air passage below the idle discharge ports to help atomize the idle mixture, resulting in a super smooth idle.
It looks like an amazing carburetor.
Good video:
The first is the "Road Demon, Jr." It is basically a Holley 4160 with a smoother intake path and improved boosters. Just like the 4160, it only has a metering block on the primary side.
The next is the "Road Demon(, sr.)" and is basically a Holley 4150 with he same improvements the Jr. has, and has metering blocks on both sides. It shares a throttle body and venturi body with the Jr.
Both carbs are avalible in 525, 625, and 725 CFM variations. The 525 has annular boosters on all four barrels, where the two larger sizes only have annulars on the secondaries; the primaries and down-leg boosters. Sounds a little bass-ackwards to me. They run in the $280-$350 range and certainly appear to be a better deal than a Holley
But the carb that really caught my eye was the "Street Demon". This carb appears to be based on the Carter Thermoquad, but in all reality was custom designed from the baseplate up. It is unique in many ways and has some of the best designs from past carburetors integrated into one. It is a 3-barrel design and the single massive secondary outflows the tiny primaries 2:1. The secondaries are controled by a mechanical progressive linkage and an adjustable air valve just like an Edelbrock Thunder AVS. The primary boosters are not annular, but are a booster within a booster within the main venturi and should atomize the fuel nearly as well as annular boosters do, in addition to increasing vacuum signal. Fuel discharge in the secondary is through two small copper pipes extending into the air path and acting like a spray bar. Primary fuel metering is accomplished through dual stage metering rods that can be replaced without dissasembling the carburetor, just like on an Edelbrock. secondary metering is accomplished through fixed replacable jets. There is even a composite bodied version to keep down the temperature of ethanol fuel. The accelerator pump jets are standard Holley units for precise tuning. The metering rods, primary and secondary main jets, and step-up springs are all replacable. Like a Quadrajet with it's tiny primaries and huge secondary, the only CFM version is 625 but fits an extremely wide variety of engines since the primaries are so small and the air valve prevents over-carburetion. It also features a small air passage below the idle discharge ports to help atomize the idle mixture, resulting in a super smooth idle.
It looks like an amazing carburetor.
Good video:
A sign of a good float system dialed in correctly is when you slam your vehicle to a sudden stop and let it lerch back to slosh the fuel while watching the RPM's. The steadier they remain, the better the float system for forward and back g-force. 
Not really any improvement to be had here, except a light wallet for poor fuel atomization.
Getting better. Probably the best carb for the $$$
Seems like a little too much carb.
Looks kinda funky on an otherwise stock restoration.
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