Call: 800.979.0122
ALWAYS SECURE
America's Oldest Speed Shop ® 800.979.0122 Lincoln, NE
Filters
Menu
Help Center
Help Center
x
x
Help Center

sales@speedwaymotors.com

Contact
Help Center
x
x
How to Contact Us

U.S.Order Line:

800.979.0122

(CST) 7am - 10pm

Race and Rod Tech Support

Mon-Fri 8am - 5pm

Canadian Order Line:

855.313.9180

International Order Line:

1.402.323.3200
Since 1952
Menu
x

Road Demon 4282010VE 625 CFM 4 Barrel Carburetor

SAME DAY SHIPPING! Order within the next 53 minutes and receive same day shipping

Free Shipping Free Shipping
Specs
Material Type:
Aluminum
Sold in Quantity:
Each
Finish:
Natural
Gasket(s) Included:
Yes
CFM:
625
Choke Type:
Electric
Fuel Type:
Gasoline
MFG. Part #:
4282010VE
Carburetor Barrels:
4
Secondary Type:
Vacuum
Fuel Inlet Type:
Dual
Road Demon 4282010VE 625 CFM 4 Barrel Carburetor

Click image to enlarge

Details

Reviews

Q & A

What's in the Box

Styled and calibrated for Street Rods and mildly modified Street Machines and light trucks, the Road Demon™ is an impressive performer. With a remarkably smooth choke tower design, vacuum secondaries and patented air entries, the Road Demon™ offers extremely smooth operation with strong throttle response. The Road Demon™ has the standard Demon carburetor features: Max–Density Cast metering–blocks with adjustable jets and four–corner idle, a billet baseplate, plus large capacity fuel bowls with patented sight glasses for tuning ease.

Perfect for small displacement V8s or V6 engines, the Road Demon™ 625 targets mild performance engines from 302 to 400 cid, and rated at 250–350 horsepower. An ideal carb for daily drivers as well as weekend cruising for a wide range of vehicles.

  • Max-Density Cast Rib-Reinforced Baseplate
  • Max-Density Cast Metering Blocks
  • Four-Corner Idle Circuitry
  • Large Capacity Float Bowls
  • Large Glass Float-Level Sight Windows
  • Integral Hi-Flow Choke Housing
  • Electric Choke Included
  • Dual-feed Inlet
  • Vacuum Secondary Operation
  • Power Valve Backfire Protection
  • "Quik Release" Non-Stick Gaskets
  • Vacuum Fittings
  • Most common tuning parts interchange from other manufacturers (jets, power valves, gaskets, etc.)
  • Quick-change Vacuum-Secondary Spring Cover 

Road Demon 4 Barrel Carburetor Installation Instructions (PDF) 

Application

We recommend the Road Demon 625 for Mild Performance and Towing applications with 302-400 c.i. V-8 engines.

Works great with camshafts under 220° duration @ .050". 

Customer Reviews

Rated 5 out of 5 by 1 reviewers.
RATING BREAKDOWN
1 reviews
5 Stars
1
4 Stars
0
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

SPEED DEMON
EL MIRAGE AZ

I WOULD BUY THIS PRODUCT AGAIN

June 20, 2010
HAVE NOT ROAD TESTED CAR YET. IT IS NOT FINSIHED, WILL KEEP YOU INFORMED. BUT HAPPY SO FAR.
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

Page 1 of 1

Product Q&A

5 questions : 5 answers

1 answers

settig my carb I have a 350 ci chevy with a demon carb when I hook up the vacuum line to the front I get good low rpm performance but not at high rpm when I put the vacuum line on the rear I have a small miss and not as good performance but high rpm it runs great any ideas

3wjim
ohio
August 26, 2014

settig my carb I have a 350 ci chevy with a demon carb when I hook up the vacuum line to the front I get good low rpm performance but not at high rpm when I put the vacuum line on the rear I have a small miss and not as good performance but high rpm it runs great any ideas

Answers

August 27, 2014
EricM
I believe you are talking about which vacuum port you are connecting the vacuum advance to. If so then you will need to connect it to the front vacuum port on the passenger side. That is a ported vacuum source which is what you need for a vacuum advance on a small block Chevy engine. I suggest that you check the ignition timing on your engine as well as determine how much mechanical and vacuum advance your distributor is providing. It sounds like the issue lies in one of those areas.
1 answers

square or spread bore?

jims
kcmo
November 02, 2013

square or spread bore?

Answers

November 04, 2013
Jason
The road demon 4 barrel carburetor is a square bore flange
1 answers

how do i hook up the elec/choke i have a small block mopar 360 with a mild build . it's in a 72 challenger and i never hook'ed up a elec choke before any help would be true'ly appr, thank's

shawnschallenger
wi
March 22, 2011

how do i hook up the elec/choke i have a small block mopar 360 with a mild build . it's in a 72 challenger and i never hook'ed up a elec choke before any help would be true'ly appr, thank's

Answers

April 01, 2011
Tech Support
It is very easy to hook up an electric choke. There should be a push-on connector on the round, plastic cover for the choke mechanism on the passenger side of your carburetor. Just hook up an insulated, copper wire (around 14 gauge should be fine) to this terminal and connect the other end of the wire to a place that has 12 volt power when your key switch is in the “run” or “on” position. You can run this wire all the way to the ignition switch if you want, or you can just go to the + (positive) side of your ignition coil (before the ballast resistor, if your car has one). You can put a 5 or 7 amp fuse in this line if you want to be safe. If your distributor has the coil in the cap (or a similar type of electronic ignition) like a Chevy, just hook the wire to the terminal on the distributor marked “IGN”. I hope this answers your question.
1 answers

CanI install a manual choke on this carb?

March 05, 2011

CanI install a manual choke on this carb?

Answers

March 09, 2011
Jason
Yes, the electric choke is just an add-on piece.
1 answers

does it have a powerbrake hook up

auxvasse missouri
October 11, 2011

does it have a powerbrake hook up

Answers

October 12, 2011
John
Part # 91012040 This carburetor does not have the large power brake port and would require using the port on the intake manifold. If the intake does not have the port available it would necessitate drilling and tapping the intake for the correct fitting.
Page 1 of 1

You may also be interested in:

Speed Demon 1282010VE 650 CFM 4 Barrel Carb, Vacuum Secondary-Electric
(Part #91012012)
                        

The Speed Demon™ series is the most formidable performance street four barrel carburetor available today. It features the most advanced design manufacturing processes that provides street enthusiasts with racing carburetor technology in a very driveable package.

The Speed Demons delivers balanced, high–velocity airflow and exceptional fuel metering capacity to match the fuel requirements most street engines.

A Speed Demon™  4 barrel carburetor is ideal for muscle cars, stock rebuilds, tow trucks, mild performance applications and crate motors. They are designed for engines with cam profiles between 220 and 240 degrees duration at 0.050".  Designed for Mild 302 to 427 cid engines

Speed Demon 650 CFM 4 Barrel Carburetor Installation (PDF) 

Demon 421440 Carburetor Electric Choke Kit
(Part #91012035)
                        

This Electric Choke Kit will convert your manual choke Road Demon, Road Demon Jr. or Speed Demon 4 barrel carburetor to a no-hassle electric choke. 

Speed Demon 1282010 650 CFM Carb, Mechanical Secondary, No Choke
(Part #91012010)
                        

The Speed Demon series is the most formidable performance street carburetor available today. It features the most advanced design manufacturing processes that provides street enthusiasts with racing carburetor technology in a very driveable package. The Speed Demons delivers balanced, high–velocity airflow and exceptional fuel metering capacity to match the fuel requirements most street engines.

A Speed Demon carburetor is ideal for muscle cars, stock rebuilds, tow trucks, mild performance applications and crate motors. They are designed for engines with cam profiles between 220 and 240 degrees duration at 0.050". Designed for Mild 302 to 427 cid engines.

  • Billet Baseplate with Idle-Eze™
  • Billet Metering Blocks
  • No Choke
  • Four-Corner Idle Circuitry
  • Large Capacity Float Bowls
  • Large Glass Float-Level Sight Windows
  • Power Valve Backfire Protection
  • Integral Hi-Flow Choke Tower Housing
  • Available in Mechanical or with Vacuum-Secondaries
  • Quick-change Vacuum-Secondary Spring Cover
  • “Quik Release” Non-Stick Gaskets
  • Vacuum Fittings
  • Most common tuning parts interchange

Speed Demon 4 Barrel Carb Installation Instructions (PDF) 

Holley 0-80670 Avenger 670 CFM 4 Barrel Carburetor, Electric Choke
(Part #42580670)
                        

The Holley Street Avenger Model 4150 four barrel carb is the ultimate vacuum secondary street performance upgrade. This 4 barrel carb is street ready right out of the box and features a calibrated electric choke, air and fuel adjustments and built in fuel filters. There are clear sights for easy float adjustments, adjustable vacuum secondaries and four vacuum ports. Plus it has a million mile power valve, is 100% wet flow tested and includes fittings.

  • No Trouble quick change vacuum secondaries - up to 6% more acceleration or 5% better fuel economy with simple spring change (springs included) 
  • Vacuum secondaries allow use on wide variety of vehicles
  • Tuneable fuel metering system
  • Dual feed fuel inlet
  • 1 timed (spark) port, 2 full vacuum, and 1 PCV port
  • Ford A/T kickdown, does not work with A.O.D. transmissions
  • Calibrated for monster low-end torque, awesome acceleration, & unmatched top-end horsepower
  • Bolt on & go design
  • Electric choke

Holley 670 CFM 4 Barrel Carburetor Installation Instructions (PDF)

Road Demon 190003 4 Barrel Carburetor Rebuild Kit
(Part #91012045)
                        

When it's time to rebuild your Road Demon 4 barrel carburetor, be sure to use a genuine Demon Fuel Systems carburetor rebuild kit. These rebuild kits include every possible gasket and seal you'll need along with many parts not included in other kits like detailed instructions and a power valve. Each kit covers virtually every carburetor in the listed "family". Available with red non–stick gaskets or reusable Buna gaskets for the fuel bowl, metering block, and bowl screws.

For Road Demon vacuum secondary carburetors.

910-12045 Instructions (PDF) 

Mr Gasket 1575 Demon Carb Chrome Dual-Feed Fuel Line
(Part #5501575)
                        

This chrome fuel line kit fits Race Demon, Speed Demon, & Road Demon carburetors. Mandrel bent 3/8" dual feed fuel line allows maximum fuel flow with minimal restriction. The chrome plated finish adds a special touch for custom or race applications.

  • Engineered for competition use
  • Eliminate fittings and adapters, with 3/8" hose barb
  • Center to center:  9-5/8"
  • Hose outlet nipple:  3/8"
  • Includes 9/16"-24 male and 5/8"-18 IFF carb fittings
  • Crush washers included
  • Fits Demon carburetors