1805 1826 Thunder Series AVS Carburetors Inst

User Manual: THUNDER SERIES AVS 1826

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INSTALLATION INSTRUCTIONS
CATALOG #1805, #1806, #1812,
#1813, #1825, and #1826
PLEASE study these instructions completely and thoroughly before installing your new Thunder Series AVS carburetor. If you have any
questions or problems, contact our Technical Hotline at: 1-800-416-8628, 7 am - 5 pm Monday-Friday, Pacific Standard Time or
e-mail us at edelbrock@edelbrock.com. Please fill out and return your warranty card.
DESCRIPTION: The Edelbrock Thunder Series carburetor has been calibrated, factory flow-tested, and preset. 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.
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.

INSTALLATION KIT CONTENTS
1 - Installation instruction sheet
1 - Owner’s Manual
1 - Warranty card
1 - Carburetor accessories brochure
1 - Square - bore base gasket
1 - Air horn gasket

1 - Air cleaner stud
1 - Vacuum " T "
1 - 1/4" pipe plug
2 - Vacuum caps
1 - Throttle cable ball end stud

1 - Red choke wire ( positive ) for 1806, 1813
& 1826 only
1 - Black choke wire ( ground ) for 1806, 1813
& 1826 only
1 - Vacuum hose for 1806,1813 & 1826 only

Check The Following Items Before Carburetor Installation
❑
❑
❑
❑
❑

Replace fuel filter. Dirt 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.

Additional Parts and Tools Required for Installation
Parts:
❑
❑
❑
❑
❑
❑

New fuel filter (Edelbrock #8135 or equivalent).
Chrome Steel Fuel Line Kit #8134 includes fuel filter.
Dual Feed Line #8132
Dual Feed Line with blue filter #8133
Dual Feed Line with polished filter #8128
Banjo Fuel Fitting #8089 (if required for fuel line clearance using your
air cleaner).
❑ New air cleaner (Edelbrock #1221 or #4221). If stock or other air
cleaner is to be used, check fit on carburetor before installation to
determine if air cleaner spacer (Edelbrock #8092; 3/4" tall) is required.
❑ Choke cable kit (manual choke carburetor) or electrical connectors
(electric choke carburetor).
❑ Carburetor adapter, if carburetor is to be installed on other than squarebore intake manifold. See Steps #4 and #5 following for specific part
numbers. 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 Linkage Kits for Ford or Chrysler applications (see “Carburetor
Preparation” section, Step #1).

Brochure #63-0170
©2003 Edelbrock Corporation

❑ Throttle, transmission and cruise control bracket #8036 or #8030
(chrome) for 1972-78 small-block Chevy. Other applications may
require modification to original throttle cable bracket.
❑ Throttle cable, transmission, and cruise control bracket #8031 for
small-block and big-block Chevy
❑ Throttle cable, transmission, and cruise control bracket #8032 for
small-block Chevy with Vortec and E-tec intakes
❑ Universal throttle return spring kit #8005 if original return spring can
not be used.
❑ Divided square-bore heat insulator gasket #9266 for dual-plane (stock
or Performer-type) manifolds. May be used in place of square-bore
adapter plate #2732 on some Edelbrock manifolds.

Tools:
❑
❑
❑
❑
❑
❑
❑

Sockets/wrenches/tubing wrenches
Pliers
Screwdrivers
Hacksaw and/or tubing cutter
Torx Driver (for electric choke models)
Wire crimpers (for electric choke models)
Test Meter or Test Light (for electric choke models)

Page 1 of 4

Rev. 2/03

FUEL INLET for 3/8" hose. Dual
fuel inlets are available (supplied
with passenger side only).

IDLE MIXTURE SCREWS
Left side screw for left side of carb
Right side screw for right side of carb

AVS Adjustment
on Page 4.

POWER BRAKE PORT
(rear lower side, 1/4" NPT)
MUST BE PLUGGED WITH
1/4" PIPE PLUG
(SUPPLIED) IF NOT USED

PART NUMBER is
stamped on pad at
front of carb

IDLE SPEED SCREW
MANIFOLD VACUUM PORT
(3/16"; distributor vacuum advance port for
non-emission controlled engines)

PCV PORT
(for 3/8" hose)
NOT FOR FUEL !

TIMED VACUUM PORT
(3/16"-distributor vacuum advance port
for emission-controlled engines)

Fig. 1 - Fittings and Vacuum Port Location

BEFORE REMOVING OLD CARBURETOR
1.

2.

3.

Determine if the distributor vacuum port is timed (no vacuum
at idle) or full (vacuum present at idle). With the engine fully
warmed up and
idling, pull the
vacuum hose off of
the carb and "feel"
for vacuum by
putting your finger
on the vacuum port.
If your distributor
has timed vacuum
advance, hook the
distributor vacuum
hose up to the
passenger
side
Fig. 2
vacuum port on the
carburetor. If it has full vacuum advance, hook it up to the driver's
side vacuum port.
The stock steel fuel line must be converted to either a fuel
resistant rubber hose or one of the Edelbrock fuel line kits. The stock
steel fuel line will not connect to the Thunder Series Carburetors.
Use one of the Edelbrock Fuel Line and Filter Kits #8133 (dual feed),
#8134 and #8135 as seen on the Edelbrock website or in the
Edelbrock catalog.
Note: After cutting fuel line, remove sharp edges and clean out
chips.
Always use a new fuel filter. Failure to do so will void the
warranty.

Brochure #63-0170
©2003 Edelbrock Corporation

4.

You must use an
Edelbrock Adapter
#2696 or Adapter/Fuel
Line Kit #2697 when
installing a Thunder
Series Carburetor on a
General Motors
Quadrajet or Chrysler
Thermoquad manifold.
#2697 includes
Adapter #2696 and
Fuel Line Kit #8135.

Quadra-Jet Adapter Kit #2697

Fig. 3

# 8133 Dual Feed
Fuel line kit

Do not use an open adapter!
# 8134 Dual Feed
Fuel line kit

Fuel Line Kit #8135
installed on stock steel
fuel line

Cut stock fuel line and add
8135 ferrule

Fuel Filter
Neoprene hose to
carburetor

Stock steel fuel
line

Fig. 4
Page 2 of 4

Rev. 2/03

5.

6.

7.

You must use an Edelbrock
Square-bore
Adapter Plate
Adapter #2732 when installing a
#2732
Thunder Series Carb on Edelbrock
Gasket
manifolds #2104, #3706, #2161,
Manifold
#3761, #2156, #2151, & #2730.
Do not use more than 6.5 psi
fuel pressure. Excessive fuel
pressure may cause flooding. If
your fuel pressure is too high,
Fig. 5
install an adjustable pressure
Installing square-bore adapter
#2732
on
Performer
manifold
regulator such as Edelbrock
#8190, or #1727.
Banjo Fuel Fitting #8089
It may be necessary to re-route
the fuel line to prevent
interference with the air cleaner.
Test fit your air cleaner on your
new carburetor before you begin
installation. Look for areas of
interference such as the choke
housing, fuel inlet fitting and fuel
line.
Fig. 6

THUNDER SERIES CARBURETOR INSPECTION
1. Check for possible damage to carburetor.
2. Make sure all throttle linkages operate freely.
3. Ensure that all fuel inlet and vacuum ports are free from packing
material.
CARBURETOR REMOVAL
1. Prior to removal make sure that the engine is cool.
2. Disconnect negative battery cable from battery.
3. Remove air cleaner. Be sure to carefully disconnect any hoses from
the air cleaner and note their location for re-installation. You may
want to mark them with masking tape for easy reference.
4. Disconnect throttle linkage, kickdown linkage (certain automatic
transmission applications only), cruise control (if equipped) and any
return springs, if present.
NOTE: Check carefully for the precise location of all these linkages
and return springs. You may want to mark them with masking tape
for easy reference.
5. Disconnect all wires, tubes and hoses from carburetor and note their
location.
NOTE: There should be a maximum of one wire to the electric choke
and one to the idle compensator solenoid. Any other electrical wiring
attached to your carburetor indicates a computer controlled engine,
and any Edelbrock carburetor will not function correctly on computer
controlled applications.
6. Disconnect the heater tube from the choke housing (if so equipped).
Edelbrock carburetor do not use the hot air style choke, so this tube
may be left disconnected with no problems. If you want to cover this
opening on a stock intake manifold, you may be able to use the
appropriate Edelbrock choke adapter plate: #8901 for small-block
Chevrolets; #8961 for big-block Chevrolets; #8951 for Oldsmobile
V8s; #8971 for 351-M/400 Fords; #8981 for 351-W Fords.
7. Carefully remove fuel line from carburetor. TAKE EXTREME CARE
NOT TO SPILL ANY EXCESS FUEL. Place a rag underneath the fuel
Brochure #63-0170
©2003 Edelbrock Corporation

line to absorb any spillage that may occur. Certain models require
two wrenches to remove the fuel line; one to hold the fitting on the
carburetor and the second to turn the fitting on the fuel line. Use a
tubing wrench to avoid rounding the tube fitting nut.
8. Remove mounting nuts or bolts and washers. Be sure to put them
where they won't fall into the intake manifold upon carburetor
removal.
9. Remove carburetor, being careful not to spill any dirt into the intake
manifold. Immediately place a clean rag into the manifold to keep
foreign objects out.
10. Remove old mounting gasket and thoroughly clean mounting
surface. Compare old carb gasket to gasket included with new
carburetor. If there is a difference in bolt pattern or bore spacing, an
adapter will be required (see “Before Removing Old Carburetor”,
section, steps #4 & #5).
CARBURETOR PREPARATION
1. Compare throttle arm of your new carburetor with the old one to be
sure that all required linkages will hook up. Install proper throttle and
transmission linkage for your particular application. Throttle stud is
removable and must be installed in the proper location. Chrysler
vehicles with automatic transmission will require Throttle Lever Kit
#1481. Ford vehicles with automatic transmission and cable linkage
will require Throttle Lever Kit #1483 and Throttle Cable Plate Kit
#1490 (for 289-302), #1491 (for 351-W), #1493 (for 351-C & 351M/400), or #1495 (for 429/460).
2. Check and prepare carburetor for proper vacuum fitting installation
(EGR, power brakes, PCV, distributor, transmission, etc.) using
supplied vacuum caps, “T”,
Ford Throttle
and hose when applicable. If
Lever #1483
vacuum port at rear of
bolts on carb
throttle arm
carb is not used, plug
with the 1/4" pipe plug
supplied.
3. On electric choke models
(see Fig. 8), remove one
choke housing retaining
screw and install eyelet end
Fig. 7
of choke ground wire (black)
to choke housing and
reinstall screw. Connect clip end of choke ground wire to negative
(–) spade terminal on choke housing.

Page 3 of 4

Fig. 8 – Choke Wire Installation

retaining screws
(3)
black wire (–);
to ground
(carb body)

red wire (+)

To ignition key activated 12V source;
not coil or alternator!
Rev. 2/03

CARBURETOR INSTALLATION
1. Remove rag from intake manifold and install new studs, mounting
gasket and adapters (where applicable). NOTE: Do not use any
cement, glue or RTV sealant on gasket.
2. Carefully place new carburetor on gasket.
3. Replace all mounting nuts and washers. Hand tighten with a short
box end wrench, alternating between diagonally opposed nuts.
CAUTION: Overtightening may break carb base and void
warranty.
4. Connect all throttle and transmission linkages and throttle return
springs. You may have to cut, bend or modify your stock throttle
cable brackets to fit the new carburetor, or use GM #352279 (see
Fig. 9). 1972-78 small-block Chevys may use Edelbrock Throttle,
Transmission,
and
Cruise Control bracket
#8030, #8031, #8032,
or #8036 (chrome).
IMPORTANT NOTE:
With engine off,
make sure that
there is no interference when opening and closing the
throttle. Be sure
there is no binding
or hanging up bet- Fig. 9 GM#352279
ween idle and wide
open throttle as this
could cause the throttle to stick open, resulting in loss of
engine speed control.
5. Connect manual choke cable to the provided lever attachment point
and cable mounting bracket (manual choke models). Electric choke
models connect red choke wire to 12 volt + source that is activated
by ignition switch (not coil or alternator, see Figure 8).
Note: If manual choke is not connected (secondary carb of dual carb
set-up, for example), then choke blade must be fixed open. To lock
open, use a stiff piece of wire between the choke lever and the
mounting bracket. Fold the wire to double its thickness about one
inch from one end. Insert the wire in the choke lever, hold choke
blade in the wide open position, and tighten cable clamp on folded
end of wire.
6. Connect all vacuum hoses to their proper location on carburetor (see
Fig. 1). Replace hoses that appear brittle or cracked to prevent
vacuum leaks.
7. Connect fuel line to carburetor. Avoid contact with any sharp edges
or areas of extreme heat.
NOTE: Some late model Ford 460 engines are equipped with hot fuel
bypass units. It is necessary to replace the stock unit with Ford
#E3TZ9N176B (with blue dot) which has a 0.040" orifice.
Manual choke cable
and fuel line connection

Fig. 10

8.
9.

10.
11.
12.
13.

Edelbrock idle compensator #8059 may be installed to raise idle
speed during air conditioning compressor operation.
Install new air horn gasket and air cleaner stud (supplied). Install air
cleaner making sure it does not contact linkage or fuel line and has
proper hood clearance. We recommend Edelbrock Pro-Flo chrome
air cleaner #1221, which is a 14" diameter open element air cleaner
that is designed to fit all Edelbrock Thunder Series carburetors.
Extremely low profile air cleaners will not fit electric choke
carburetor without air cleaner spacer #8092 (due to choke and fuel
line interference) but will fit manual choke carburetor when used
with 90° banjo fuel inlet fitting #8089.
Mark air cleaner stud for proper length, remove from carburetor and
cut with hack saw. Deburr stud and re-install in carburetor.
Re-check all linkage for smooth throttle operation.
Re-connect the negative battery Fig. 11
cable to the battery.
Start the engine and check for
fuel or vacuum leaks. With
engine at normal operating
temperature and choke fully
open, set idle speed and mixture
screws (see carburetor Owner’s
Manual).
CAUTION: Be alert to carburetor flooding. Flooding can be caused
by dirt, small particles of hose cuttings, floats and inlet needles
which have settled during shipping. When the fuel pump is turned
on or when the engine is first started, watch closely for signs of
flooding. If flooding occurs, turn engine off immediately and lightly
tap on the side of the carburetor that is flooding, in the rear needle
and seat area with a rawhide mallet or wooden handle of a hammer.
Start engine and see if flooding continues, if so refer to owner’s
manual.

ADJUSTING THE AIR VALVE SECONDARY
1. With Torx drive (T15) and flat blade screw driver in place, loosen Torx
screw, make sure flat blade is secure to prevent loss of spring
pressure.
2. If you lose spring pressure, turn flat blade screw counter-clockwise
until the air valve reaches closed position plus 1-1/2 turns to achieve
the factory setting.
Flat Blade
Torx
3. The factory setting
is the most common
setting. If additional
tuning is required,
turn the air valve
screw
counterclockwise to make
the air valve open
later, it is not
recommend to go
beyond one turn
Fig. 12
more than the factory setting.
Edelbrock Corporation
2700 California Street
Torrance, CA 90503
Toll Free Tech Line: 1-800-416-8628
Tech E-Mail: edelbrock@edelbrock.com

Brochure #63-0170
©2003 Edelbrock Corporation

Page 4 of 4

Rev. 2/03



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