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PERFORMANCE CARBURETOR INSTALLATION AND ADJUSTMENT INSTRUCTIONS PERFORMANCE CARBURETOR
INSTALLATION AND ADJUSTMENT INSTRUCTIONS
Read instructions thoroughly before, during, and after installation.
NOTE: This carburetor is for use on Motor Vehicle Applications Only!
Universal Double Pumper (650, 700, 750, and 800 CFM)
Holley Performance Products cannot and will not be responsible for any alleged or actual engine or other damage, or other conditions resulting
from misapplication of the products described herein. However, it is our intent to provide the best possible products for our customer; products
that perform properly and satisfy your expectations. Should you need information or parts assistance, please contact our Technical Service
Department at 1-270-781-9741, Monday through Friday, 7 a.m. to 5 p.m. CST. Please have the part number of the product you purchased on
hand when you call.
This carburetor has been specifically calibrated for peak performance at the racetrack. NOTE: This carburetor is not a street oriented
calibration and does not have the capability of meeting Federal or California exhaust emissions standards. In addition, this calibration will
provide less than optimum driveability and fuel economy if it misapplied and used on late model street engines, which operate at high
temperatures.
Many people mistakenly believe that they will realize performance and economy gains by using a non-emissions carburetor on an emissions
oriented engine. This is simply untrue. The requirements for reduced exhaust emissions on all late model vehicles has stimulated increased
carburetor development. Research and development efforts have resulted in carburetors, which feature the same full power fuel calibration as
carburetors of the muscle car era and yet deliver improvements in fuel economy and reduction of exhaust emissions levels. Late model
emissions carburetors do not contain secret emissions controls. They simply provide the various timing mechanisms, which can trigger other
emissions control devices. Regardless of the condition of your emissions control systems, best fuel economy gains will probably be realized by
using the Holley Emissions Design/Street Performance carburetor recommended for your vehicle.
WARNING: This carburetor is NOT designed for use with any automatic overdrive transmissions. If used on an automatic overdrive vehicle,
severe transmission damage WILL result.
NOTE: Due to the absence of a transmission kickdown lever, this carburetor should not be used on Ford applications equipped with an
automatic transmission.
INSTALLATION INSTRUCTIONS
Since this carburetor is intended for racing applications, and since such applications often differ greatly, these instructions are very generalized.
It is assumed that the person making the carburetor installation has basic automotive skills and experience.
This carburetor is not a direct, bolt-on (i.e. custom linkage pieces may be required on off-road engine packages).
1.
Remove the air cleaner.
2.
Disconnect the throttle linkage and throttle return spring.
3.
Disconnect the vacuum advance hose (to distributor), PCV hose, and fuel line.
4.
Remove the carburetor from the intake manifold.
5.
Remove the existing carburetor flange gasket on the intake manifold. Use a gasket scraper to assure that no small particles of the old
gasket remain. Make sure that no pieces of the old gasket material fall into the manifold. NOTE: Cover the manifold opening while
cleaning the carburetor flange.
6.
If a different manifold is to be installed, the following should be considered:
A. Run a cleanup tap into each manifold bolt hole in the cylinder heads. This will remove any foreign deposits and enable even torquing
of the manifold bolts. Chances of manifold vacuum leaks resulting from manifold warpage will be minimized by this extra attention.
B. Coat each side of the intake manifold gaskets with a good silicone based sealant.
C. If cylinder heads are being milled to increase compression, remember to mill the manifold head surface to assure proper port
matching and sealing.
7.
Install the throttle ball in the appropriate position on the throttle lever (See figure 1). Some Chrysler applications may require a Chrysler
throttle lever extension (Holley P/N 20-7). This is installed as shown in figure 2.
8.
If the vehicle requires other linkage hardware, such as automatic kickdown linkage stud, remove the stud from the original carburetor and
install it in the appropriate place on the throttle lever.
9.
Install the carburetor flange gasket on the intake manifold. 2
Figure 1
Figure 2
10. Place the carburetor on the manifold. Open the throttle and check to assure that the throttle plates do not interfere in any way with the
manifold. A lip resulting from manifold bores, which are smaller than the carburetor bores will disturb cylinder-to-cylinder distribution,
restrict airflow, and result in compromised performance. If necessary, have the manifold bores machined to the same diameter as the
carburetor throttle bores.
11. Install the carburetor holddown nuts and snug nuts progressively in a criss-cross pattern (See figure 3). WARNING: Overtightening may
result in warped or cracked throttle bodies and/or binding throttle action resulting in an unstable return-to-idle.
12. Reconnect the throttle and transmission kickdown linkage or throttle return spring. Operate the linkage from inside the vehicle or have
someone check to assure complete opening of the carburetor throttle plates.
WARNING: Check the assembled linkage for sticking and/or binding throttle action. Any sticking, binding, or other interference in the throttle
linkage could result in uncontrolled engine speed.
NOTE: If this carburetor is being installed along with an intake manifold on a vehicle, which was originally equipped with a 2BBL induction
system, it will probably be necessary to purchase a throttle cable mounting bracket. This should come from a 4BBL engine of the same
engine family in order to provide proper mounting and operation of the throttle cable and other linkage. 3
Figure 3

13. Reconnect the appropriate vacuum hoses noting the correct fitting from Figures 1,3, and 4.
A. Plug any vacuum source not used.
B. The timed spark fitting does not provide vacuum for distributor advance at idle. Vacuum for advance is available as soon as the
throttle is opened from idle and the engine is placed under a load, such as acceleration or cruise. If in doubt as to the operation of this
vacuum source, connect a vacuum gauge to the fitting and drive the vehicle noting the various vacuum readings.
Figure 4
14. The fuel line will have to be cut and connected to he carburetor using a dual-feed fuel line, such as Holley P/N 34-1. See Figure 5. When
cutting the fuel line, use a tube cutter to provide a clean cut. 4
WARNING: In all cases where the fuel line has been cut, it is essential that it be clean to insure that no metal particles enter the fuel bowl after
the new carburetor installation. This is performed by disconnecting the fuel line at the pump and blowing the line clean with
compressed air. Holley DOES NOT recommend the procedure where the coil wire is disconnected, the engine is cranked for a
few revolutions, and the fuel is collected in a container. This procedure is unsafe, because sparking can occur either at the coil, or
at the distributor end of the coil wire, and then ignite any fuel spilled in the engine compartment.
NOTE: It is essential that a quality inline fuel filter be installed between the fuel pump and the carburetor. See Figure 6 for the application to
your particular fuel line.
Figure 5
HOLLEY UNIVERSAL INLINE FUEL FILTERS
These specially designed inline filters do not restrict fuel flow, but allow for maximum fuel volume to the carburetor, while filtering out any and all
foreign material.
Figure 6
Filter elements should be blown clean with compressed air every 6,000 miles and replaced every 12,000 miles to assure maximum protection.
NOTE: It is often useful to use Teflon tape to help seal the fuel fittings on chrome dual-feed fuel lines. If Teflon tape is used, do not cover the
first two threads of the flared tube nuts (See Figure 5). This will assure that no Teflon tape will be torn by the threads and flake off to
stick in the needle and seat resulting in flooding.
15. Install a suitable manual choke cable, such as Holley P/N 45-228 and choke mounting bracket P/N 45-229. Check to make sure that the
choke fully opens with the cable. See Figure 7.
16. Start the engine and check the fuel line and inlet fittings for possible leaks. At this time, recheck to assure all existing vacuum hoses are
attached properly. Plug any fittings that are not used.
17. Adjust the idle using the idle mixture screws (clockwise adjustments lean the mixture, counterclockwise richens the mixture). As a starting
point, set the needles 1 1/2 turns out from the full lean position, and then adjust for best idle.
18. Install the air cleaner stud from unassembled parts. Place the air cleaner gasket on the carburetor air cleaner sealing flange. Install the air
cleaner.
WARNING: Inadequate clearance between the air cleaner and the throttle lever could result in uncontrolled engine speed. Check the
cleara