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Demon Carburetion 625 cfm Street Demon Carburetor 1-3/8" Primary Throttle Bores


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625 cfm Street Demon Carburetor 1-3/8" Primary Throttle Bores
More than 10 available
625 cfm Street Demon Carburetor
  • 1-3/8" Primary Throttle Bores
  • Universal
  • Vacuum Secondary
  • Electric Choke
  • Polymer Finish
  • Free Shipping - Ships

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    1901 - Demon Carburetion Street Demon Carburetors is rated 4.6 out of 5 by 29.
    Rated 5 out of 5 by from Simplicity at it’s finest Building a new motor, the demon fits the bill, Haven’t fired it up yet
    Date published: 2020-04-12
    Rated 5 out of 5 by from Worked Right off the Box Bought this for my 64 Chevelle SS and only needed a minor adjustment. Noticed a quicker take off and smooth idle. Only issue is that it has to warm up otherwise it revs a little to high in the mornings. I may may need to do another adjustment.
    Date published: 2019-08-09
    Rated 5 out of 5 by from Finally got the 625 street demon carburetor installed. I only had to adjust the secondary air valve and a minor adjustment to the choke heater. Spark plugs are now a tan color and the engine has crisp throttle response. Great carburetor.
    Date published: 2019-03-28
    Rated 5 out of 5 by from I put this on a 72 chevy 3/4 4x4 firewood pu. Where I was using 3/4 tank of fuel I'm now using less than 1/4. I have more power than my edelbrock as well.
    Date published: 2018-07-19
    Rated 5 out of 5 by from Awesome features Bought this Street Demon Carb two weeks ago to replace my old Edelbrock 1406. The street demon looked awesome right out of the box. Installed it in my 69 C20 with 5.3 LS1 hot cam. Insulation was easy, it came with everything I needed to hook up to my 4L60 trans, turned the key, fired right up..., This carb made my motor sound and run awesome... I will be purchasing another one for my other trucks... Thank you Holley for making a awesome and affordable carburetor...... #shopjegs..
    Date published: 2017-11-07
    Rated 5 out of 5 by from As close to fuel Injection as you can get!! I bought this carburetor to replace a newly rebuilt Quadra jet the difference is night and day the street demon 625 really woke my Chevy 350 up highly recommend this car I bolted it on adjusted it a bit with a vacuum gauge and it runs amazing!
    Date published: 2017-10-17
    Rated 5 out of 5 by from great put this on my 57 pickup with a 383 and started right up,much better than my old carb,i would recomend this to everyone
    Date published: 2017-08-07
    Rated 5 out of 5 by from Very Impressed I read every review and watched every Youtube video on this carb before buying. It appeared to be the way to go from what everyone was saying. It was to replace the Edelbrock 650 on my SBC in my 47' Ford Coupe. The only mods done to this motor are headers and a Edelbrock Aluminum intake. With the Edelbrock carb, i was getting extremely hard cold starts, flooded out warm starts, huge dropouts in the acceleration, constant smoking out the tailpipe, and horrible fuel mileage. The Demon came with everything I needed to install, the only I went to the parts store for was a clear, inline fuel filter, and new vac lines. My Edelbrock Air filter base fit on the carb with some minor tweaking. Once the carb was installed, i bumped the electric fuel pump about 5 or 6 times like the instructions said and hit the key, it took about 2 pumps of the accelerator and she fired and idled perfectly. The only adjustments I made to the carb was setting the idle to about 900 RPM at operating temp. Cold starts have now gone from pumping the pedal 15 or 16 times to twice, hot starts have gone from flooding and holding the pedal to the floor to get started to 2-3 seconds of cranking and starting. The smoking out the tailpipe has more than cut in half, the throttle response is tight, crisp and way more fun. While I havent actually checked the mileage, I can tell its getting better just from fillups. The 4-barrels open on demand with no dropouts in acceleration. This carb has improved the driveability of my car 10 fold!! I did not tell the wife I was swapping carbs and her first comment was " why is the car so much quieter and doesn't stink as bad?" (I'm assuming the quieter part comes from the fact that I was able to set the idle lower) This is now my go to carb, I am ordering another one for my 68' GTO and selling the 650 dbl pumper on CL. I dont normally write reviews but was so impressed with my results that I felt compelled to let other people know as I was very hesitant before I bought.
    Date published: 2016-12-11
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    I have a 1985 c10 350(quadrajet) th350, what besides the carb do I need to install properly?

    Asked by: Ole2010
    You will need the fuel line and the linkage to connect this.
    Answered by: Rusty B
    Date published: 2018-08-03

    Will this carb work on a 1982 van with a 305 350 transmission 

    Asked by: Ricky james
    This carburetor needs a square flange intake, your 82 van probably has a quadrajet intake so you will need this adapter. https://www.jegs.com/i/JEGS-Performance-Products/555/15440/10002/-1
    Answered by: Rusty B
    Date published: 2020-10-17

    Does this carb come with all the necessary installation hardware or do I need to get the Demon carb install kit as well

    Asked by: TimmyB
    This is just the carb only. You may want to get the install kit along with it.
    Answered by: Jon Jegs Tech
    Date published: 2018-02-06

    Do I need any special linkage for a mopar AT application?

    Asked by: Steve61
    No, you shouldn't need any special linkage for your Mopar.
    Answered by: Rusty B
    Date published: 2018-01-24

     I’m torn about what cfm would be best for my car. I’ve got a 77 corvette with a SP 383 GM Crate engine, th350 trans/w 2500 stall, 308 gears.  Engine has 9.6 compression, high performance valve train w/509 in.,528 exh.  222/230 duration roller cam and roc

    Asked by: Gmack
    I would recommend going a little larger like a Holley 670 Street Avenger #0-83670 or even 700cfm.
    Answered by: Dean R
    Date published: 2018-01-23

    will this carburetor bolt up directly to #555-513018 intake manifold?

    Asked by: Chet 53
    Yes that carb will bolt to that intake.
    Answered by: BrandonJ
    Date published: 2018-04-05

    Will this replace Rochester qjet without an adapter?

    Asked by: Ichigo229
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