Street Demon Carb

Hi Guys. The Edelbrock #1406 on our 74 Barracuda is 25 years old and has been rebuilt a few times and seen better days. I am thinking about replacing it with a Street Demon #1901. The motor is a pretty stock 318 with a 340 intake manifold, 340 cam, lifters and springs with cast iron manifolds and duals. It has a torqueflite and 3:55 gears. Will this carb fit the stock Mopar manifold and air cleaner. Anyone here using this carb and how do you like it. Thanks for any input.

I cant remember if it was the street demon or the street avenger that gets good reviews. I think any 500 cfm carterbrock will work fine for you.

What stock intake? A 74 318 didn't come with a 4bbl so who knows what you have.

Here's a LINK to the install instructions

It does say "If installing the Street Demon™ on a factory cast iron spread bore style manifold, a spacer may be required for proper throttle opening."

If you have EGR you will probably need a spacer to clear, may be needed to clear the choke well as well. Though with today's gas it's probably needed regardless.

Or seeing as to how the 1406 you have lasted 25 years and it's already installed consider another one, still being made.

A guy on FABO has 2 of em for sale seperately for reasonable money.

The CarterBrocks are not bad carbs, but their calibrations are from a different generation and their design is over 50 years old with no real updates. Again, not a bad carb, but there are better choices today.

The Street Demon carbs are about the most recent design out there and have some design advances that offer real world advantages. Triple stack boosters, spread bore design, phenolic center, secondary air valve, calibration for today's fuel, etc.

I have used the CarterBrocks since the 70s and have been installing the Street Demons the last few years. There simply is no comparison between them, the new Street Demon is a better carb for us today. Frankly, I believe the only guys that would recommend an old CarterBrock over a new Street Demon is someone who had not ran any Street Demons.

There are lots of threads on this subject here on Moparts and plenty of reviews on the web. A search will bring a lot of info.

https://www.youtube.com/watch?v=YNAlVFtUFL4

https://www.hotrod.com/articles/street-demon-750-carb-review/

Not interested in buying all the parts, jets, rods and such for yet another line of whizzbang carbs. If I ever get tired of the AFB design and want to go in a new direction, it won't be with another type of carb. I will just put a FiTech or Sniper on it. No need for tuning parts, or tuning for today's gas, or empty float bowls,

me too ! i dearly LOVE the thermoquad, but hard to get parts for, except for rebuild kits, and i have a bunch of jets and metering rods.
in the future, i plan on a 2-4 setup, and it WILL be a fitech or sniper.
i still won't turn down Cheap carbs and parts though.

I said the motor is mostly stock. The manifold is off a 1970 340. The reason for asking is that there is a lot of new technology out there and I was interested in knowing if anyone tried the other carb I mentioned.

Point is a 70 manifold is a squarebore one and you will need an adapter to fit the Speed Demon but no EGR valve to clash with the linkage, that's why telling us what you have is important.

Had it been a 73 340 intake then it would be a spread bore intake which should clear and you would have had EGR to deal with if it hadn't already been blanked off.

See how that works?

Street demon won't clear the choke well on a spread bore. It will clear on an older edelbrock 318/360 performer though. Watch ebay for factory reman street demons at low prices.

I was unclear, by clearing I meant the throttle blades shouldn't hit the intake on a 73 intake, I mentioned above the the choke well could be an issue.

All of these issues are partly why I suggested considering another 1406 since all that is already sorted.

I checked with the tech at Jegs and he said the Street Demon will fit same as the edelbrock on there now. Thanks.

57Fury440 there is a lot of wrong information above.

The Street Demon is not spreadbore, and it will not work with the later 340 spreadbore intake that thermoquads came on. I believe its actually the primaries that bind on those intakes. If you in fact have the 1970 340 intake (four holes) it should work on that intake. The Street Demon pattern is much closer to the Holley 3 Barrel design, except the rear barrel butterfly is goggle shaped instead of an elongated oval. Its the "nose portion" cutout of the goggle that allows it to flip open on regular intakes, unlike the big oval holley three barrel which required a notch in the intake to accommodate it, this is why LD340's came from the factory with a notch between the secondaries.

Part of the Street Demons choke housing does hang a little below the rest of the base mounting surface. Its a small bit of the choke pull off mechanism so it MAY fit nicely into the intake's choke well, or at most you'll need a thick base gasket or a couple thin ones stacked together.

If you have a low profile air cleaner that can be a problem as the accelerator pump level sticks up above the top casting that same way a thermoquads does. On mine I had to cut a hole in the air cleaner there and tack in a little bubble to make clearance. If you are using a stock style air cleaner you are probably good to go. Just test fit everything as you go.

Hooking up linkage was a pain in the ass for me. The throttle lever pin they sell for the street demon, I couldn't even figure out how it was supposed to work. I ended up using a holley throttle lever adapter and a stock mopar pin/stud whatever you want to call it but had to drill a new hole in the adapter lever to get the overall throw of the lever to match up with the factory kickdown linkage.

While you are at it I would highly suggest ordering the tuning kit that has rods/springs/jets etc. Mine was super rich from the factory.

Be advised that the tiny little screws that hold down the metering rod springs are put on with loctite at the factory. Making them easy to snap if you aren't expecting them to be glued in. A tiny pencil torch from harbor freight to heat up just the area around the screw is useful.

Good luck!

Great! When you find out that it doesn't, please let us know which compromise you settled on.

A lot of good info here, thanks. I will most likely get another Edelbrock 1406. I know it will fit and the old one worked fine for years. Thanks again.

The profile of the base of the Street Demon is almost the same as the Edelbrock he is already using, so what exactly is the issue you think is there?

I have a 73 Charger Rallye 340 4 speed. Factory carb is a Carter TQ which is a spread bore carb. Ran great except I got tired of fiddling with the factory choke all the time.

I installed a spread bore to square adapter with the 4 individual runners. I of course made an adapter to raise the accelerator cable.

I first tried an Edelbrock 1406. Started and ran great. Gas mileage was not as good as TQ, and did not push you back in your seat like the TQ when you floored it.

I then tried the Street Demon. Great carb. Easy to set up. Ran well. Idled well. Gas consumption good. Much better than Edelbrock when you floored it, but not quite like the TQ.

Bottom line is that the Street Demon is exactly what you see and hear on youtube and on the internet. Easy to set up. Runs great. Good all around carb.

I personally opted to go back to the TQ and replaced the factory electric choke with a manual choke. I know it's very old school, but I'm old enough to where I know how to use it.
I know many have had bad experiences with TQ, but when you have a good one it's great. When you have a bad one, you have my sympathy.

Not a spreadbore?

I suppose the easy definition of "spreadbore" is larger rear butterflies then front. But most people I know consider the AFB, AVS, Holley to be squarebore and T-quad and Q jet to be spreadbore carburetors. A LOT of carburetors actually have smaller front than rear butterflies it's obvious on this AFB, but if you take apart as many carbs as I have you'll find the butterflys seldom interchange front to back.

In this picture you can see that the squarebore intake, like the OP has, will fit just fine. At least throttle bore pattern wise. Choke, linkage, etc may be a different story.

However attempting to put the carb onto an intake made for actual spreadbore carbs like the thermoquad. Not so much. In addition to the MUCH larger secondary bores, the fronts are spread much wider, and the butterflys on the Street Demon will hit the big wide center divider on the factory manifold. Which is why the instructions say that it may need an adapter on factory spreadbore intakes.

The instructions say that a spacer may be required, not that an adapter may be required. Big difference. And most of us use a spacer anyway to further insulate the carb or to increase intake volume. Also, a spacer would deal with the possibility of carb to intake interference.

Just not a big deal. The Street Demon is the best carb for many of our cars and will work with almost all intakes, although it may want a spacer like many of us are using anyway.

I ended up getting the Speed Demon. I installed a spacer ( which I had ) and modified the bracket for the throttle cable ( it needed to be a little taller ). It bolted on and everything works great. I don't remember the car having such nice throttle response. I haven.t had it on the parkway yet but everything seems to be good. Thanks again for all the info.

But does it make the TQ howl?


adapter/spacer I think we all meant the same thing

NO! - it doesn't make that awesome sound - but it is a vastly better carb than the Edelbrock or the T-Quad for a daily driver / street car. I reluctantly upgraded from my old "Demonsizzled" Thermoquad due to how much of a pain in the butt it is to get good parts, and the difference is night and day better with the Street Demon. Started w/ a 650 on my '82 AHB Gran Fury w/ 318 + Edelbrock Performer; also replaced the original Carter AFB on my '66 Plymouth Fury w/ 383. A BIG help was doing the Lokar throttle and trans-kickdown cables at the same time. BTW had no interference issues w/ the throttle blades - tried it on both the stock 4BBL cast iron manifold and the Performer.

On a side note - who here remembers Demonsizzler's T-Quad modification program? He did some great work for me years ago...

Unfortunately he sunk without trace, along with my money

He helped me several times and I still run one of his carbs today! What ever happened to him?

Has anyone used the Street Demon in a dual quad application instead of the Edelbrocks or AVS/AFB carbs?

I thought I read where Demonsizzler was trying to sell the business, it sold (to who? are they doing TQ work still?), and he retired. Business was in Stone Mountain, Ga, if anyone wants to try to track him down.