Holley 550-407, Installation Manual, Page: 8 / 54

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NOTE: On Chrysler vehicles, a lever extension will be needed, Holley PN 20-7. Van applications may require the use of throttle lever
extension Holley PN 20-14.
6. Install external throttle return springs that you previously removed from the carburetor. External springs should be used in addition to
the springs on the throttle body itself. Have an assistant get in the vehicle and fully depress the accelerator pedal. Make the
necessary adjustments to the throttle linkage to insure that the throttle reaches wide-open position when the accelerator is depressed.
Work throttle linkage back and forth several times to ensure that it operates smoothly with no binding or sticking.
DANGER! Failure to attach the throttle return spring or a sticking throttle may result in uncontrolled engine or vehicle speed,
which could cause personal property damage, serious injury, or death.
8.3 MAP Sensor Installation and Vacuum Line Connections
1. Connect the vacuum lines that were disconnected in section 7.0.
Figures 2 & 3 show the function of the ports in the
TERMINATOR™
throttle body.
Figure 2 Figure 3
8.4 Fuel Pump, Fuel Line, and Filter Installation
A complete high pressure EFI fuel system must be installed for the
TERMINATOR™. The pump should be capable of supplying 255
liters/hour or 400 lb./hr. of fuel at 45 PSI. If using an in-line fuel pump, there should be a coarse pre-filter before the pump. All systems
should contain a 10 micron post filter after the fuel pump. An EFI fuel pressure regulator is required. It should be instal led after the
throttle body. See
Figure 4 below for proper fuel system plumbing.
NOTE: The regulator pressure should be set to 43-45 PSI when adjusting the fuel pressure regulator with the fuel pump running.
Holley offers four fuel system kits. These kits contain all components except the return line. They include detailed instructions
(downloadable at
www.holley.com ). These kits are:
526-1
– Braided Stainless Lines, Billet Pump, Regulator, and Filters
526-2
– Pro-Lite 350 Hose, Billet Pump, Regulator, and Filters
526-3
– Super Stock Hose, Billet Regulator, 12-920 Fuel Pump, and Filter
526-4
– Super Stock Hose, Billet Regulator, 12-920 Pump, and Metal Filters
Figure 4
8.5 Oxygen Sensor Installation
The oxygen sensor should be mounted at a point where it can read a good average of all the cylinders on one bank. This would be
slightly after all the cylinders merge. Do NOT mount the sensor far back in the exhaust as this will negatively impact closed loop
operation response. If you have long tube headers, mount the sensor approximately 1-
10” after the collector. You must have no less than
18
– 24” of exhaust pipe after the sensor.