EDELBROCK THUNDER SERIES AVS CARBURETORS Part #1801, 1802, 1803, 1804, 1805, 1806, 1812, 1813, 1825, 1826
INSTALLATION INSTRUCTIONS
PLEASE study these instructions carefully before beginning this installation. Most installations can be accomplished with common tools and procedures. However, you should be familiar with and comfortable working on your vehicle. If you do not feel comfortable performing this installation, it is recommended to have the installation completed by a qualified mechanic. If you have any questions, please call our Technical Hotline at: 1-800-416-8628, 7:00 am - 5:00 pm, Pacific Standard Time, Monday through Friday.
IMPORTANT NOTE: Proper installation is the responsibility of the installer. Improper installation will void your warranty and may result in poor performance and engine or vehicle damage.
DESCRIPTION: Edelbrock Thunder Series AVS carburetors have been calibrated, factory flow-tested, and preset. These instructions also apply to carburetors featuring our EnduraShine™ finish. Please read all instructions prior to installation. For "Theory of Operation" and "Tuning Procedures", see the accompanying carburetor Owner's Manual. These are non-emissions carburetors, check your local emissions laws.
ATTENTION: EDELBROCK CARBURETORS ARE NOT CALIBRATED FOR OR COMPATIBLE WITH ALCOHOL RACE FUEL OR E85 PUMP FUEL. USE OF ALCOHOL OR E85 IN YOUR EDELBROCK CARBURETOR WILL DAMAGE YOUR CARBURETOR AND VOID YOUR WARRANTY. THESE FUELS CAN ALSO DAMAGE OTHER FUEL SYSTEM COMPONENTS, UNLESS SPECIFICALLY DESIGNED FOR USE WITH ALCOHOL FUELS.
NOTE: Edelbrock Thunder Series carburetors are not for computer-controlled applications. That includes some 1981 & later GM vehicles with Q-Jet carburetor and some 1981 & later Ford vehicles with automatic overdrive (AOD) transmissions.
SPECIAL NOTE (1803 & 1804): These 500 CFM carburetors are calibrated for out-of-the-box performance on dual-quad applications ONLY. For single-carb applications, you should use carburetor 1801 or 1802. If you already have carburetor 1803 or 1804 you can recalibrate the carburetor prior to use. Calibration Kit #1486 contains all jets and rods necessary to recalibrate 1803 or 1804 carburetors. Edelbrock has found the following to be a good starting point for most performance applications requiring a 500 CFM carburetor:
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Primary Jet |
.086” (Factory setting) |
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Primary metering rod |
.065” x .052” (#1460) |
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Secondary Jet |
.095” (#1426) |
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Air Valve Secondary Setting |
1-1/2 Turns (See Fig. 12, Page 6) |
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KIT CONTENTS |
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1 |
Installation instruction sheet |
1 |
1/4" NPT pipe plug |
1 |
Owner’s Manual |
1 |
Throttle cable ball end stud |
1 |
Warranty card |
1 |
10-32 Hex nut |
1 |
Square-bore base gasket |
1 |
3/16” Internal star washer |
1 |
Air horn gasket |
1 Red choke positive wire (Electric choke carburetors only) |
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1 |
Air cleaner stud |
1 Black choke ground wire (Electric choke carburetors only) |
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2 |
5/32” Vacuum caps |
4 |
5/16” SAE flat washers (EnduraShine™ finish only) |
1 |
5/32” Vacuum “T” |
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CHECK THE FOLLOWING BEFORE BEGINNING INSTALLATION
WARNING: WHEN WORKING AROUND GASOLINE, ALWAYS WORK IN A WELL VENTILATED AREA, AND KEEP ALL OPEN FLAMES, SPARKS AND OTHER SOURCES OF IGNITION AWAY FROM THE WORK AREA. FAILURE TO DO SO CAN RESULT IN A FIRE OR EXPLOSION.
Replace fuel filter. Dirt (i.e. corrision residue or other debris) found in carburetor voids warranty.
Check and replace the air filter, if necessary.
Check PCV valve and replace, if clogged.
Check all hoses for leaks or cracks and replace, if necessary.
Check fuel pump for proper operation and replace, if necessary.
Check the intake manifold and cylinder head gaskets for leaks and replace, if necessary.
Check the ignition system: clean and gap or replace spark plugs, plug wires, and adjust ignition timing.
Part #1801-1806,1812, 1813, 1825, 1826 |
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©2010 Edelbrock LLC |
Rev. 6/10 - AJ/mc |
Page 1 of 6 |
Brochure #63-0170 |
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RECOMMENDED TOOLS |
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Sockets/wrenches/tubing wrenches |
#20 Torx Driver (for electric choke models) |
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Pliers |
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Wire crimpers (for electric choke models) |
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Screwdrivers |
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Test Meter or Test Light (for electric choke models) |
Hacksaw and/or tubing cutter |
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PARTS RECOMMENDED FOR INSTALLATION
New Fuel Filter (Edelbrock #8135 or equivalent) or Fuel Line/Filter kit such as Chrome Steel Fuel Line Kit #8134, Dual Feed Line #8132, Dual Feed Line with blue filter #8133, or Dual Feed Line with polished filter #8128
Banjo Fuel Fitting #8089 (If required for fuel line clearance)
New Air Cleaner (Edelbrock #1221 or #4221 recommended)
Air cleaner spacer #8092 (3/4”) (If using stock air cleaner)
Choke cable kit (manual choke carburetors)
Throttle Linkage Kits for Ford or Chrysler applications (see “Carburetor Preparation” section, Step #1)
Electrical connectors (electric choke carburetors)
Carburetor adapter, for other than square-bore intake manifolds. Do not use a 4-bbl. to 2-bbl. adapter. Edelbrock carbs must be used on intake manifolds designed for 4-bbl. carburetor only!
Throttle cable, transmission, and cruise control bracket #8031 for small-block and big-block Chevy, or #8032 for small-block Chevy with Vortec and E-Tec intakes. Other applications may require modification to original throttle cable bracket.
Universal throttle return spring kit #8005 (If original return spring cannot be used)
INSTALLATION PROCEDURE
FUEL INLET For 3/8” hose. Dual fuel inlets are |
IDLE MIXTURE SCREWS |
AVS ADJUSTMENT |
available (Supplied installed on passenger side. |
Left side screw for left side of carburetor |
(See Page 4) |
May also be moved to driver side) |
Right side screw for right side of carburetor |
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PART NUMBER |
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(Stamped on pad at front |
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of carburetor; Except |
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POWER BRAKE PORT |
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EnduraShine™ models) |
(Rear of Carburetor - 1/4” NPT) |
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MUST BE PLUGGED WITH |
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SUPPLIED 1/4” PIPE |
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PLUG IF NOT IN USE |
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IDLE SPEED SCREW |
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MANIFOLD VACUUM PORT |
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PCV PORT |
(3/16” - Vacuum is present at idle) |
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TIMED VACUUM PORT |
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(For 3/8” hose) |
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(3/16” - Vacuum is introduced off idle) |
NOT FOR FUEL! |
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Figure 1 - Fittings and Vacuum Port Location
Part #1801-1806,1812, 1813, 1825, 1826 |
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©2010 Edelbrock LLC |
Rev. 6/10 - AJ/mc |
Page 2 of 6 |
Brochure #63-0170 |
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