Holley 550-407, Installation Manual, Page: 6 / 54

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5.0 TOOLS REQUIRED FOR INSTALLATION

Standard wrench set

Small blade screwdriver

Allen Wrench set

Medium blade screwdriver

#2 Phillips screwdriver

Digital Volt meter

Drill and assorted bit sizes

Hole saw
(2”) (depending on ECU location)

Terminal crimping tool

Factory Service Manual for your vehicle

02 Bung Installation (drilling, welding)
An assistant is necessary for some installation and adjustment procedures and should be present for safety reasons.
6.0 COOLANT TEMPERATURE SENSOR INSTALLATION
The coolant temperature sensor ( Item 6 ) must be installed in a coolant passage in either the intake manifold or cylinder head. The sensor
has 3/8” NPT threads. If only a ½” NPT port is available, an adapter will have to be used. It is best to drain the some of the coolant before
the sensor is installed. Do not install the sensor in the thermostat housing, or in an area that will not see a constant flow of coolant.
7.0 REMOVAL OF EXISTING COMPONENTS
1. Disconnect the battery and remove the air cleaner.
2. Before disconnecting any vacuum hoses, it is a good idea to sketch out the vacuum hose routing. Using masking tape and a
permanent marker, mark all the vacuum hoses, vacuum sources, and ports before removing the old fuel delivery system.
3. Remove and discard the fuel line that connects to the carburetor from the mechanical fuel pump. This will not be needed in the
installation. Remove the throttle return springs and keep for later installation.
4. If required, replace the intake manifold at this time. Proceed to step six if this is not required.
A 4-BARREL STOCK OR
AFTERMARKET SQUARE FLANGE INTAKE MANIFOLD, AS WELL AS SOME UNIVERSAL FLANGE AFTERMARKET SPREAD
BORE INTAKE MANIFOLDS ARE REQUIRED FOR THE INSTALLATION OF THE HOLLEY TERMINATOR
™ EFI TBI system. An
option with some GM and Chrysler engines is to use manifold adapter Holley PN 17-6. This adapts the spread bore
carburetor manifold to the Holley square flange.
5. Place clean shop towels or rags into the manifold opening to prevent dirt or debris from entering the engine. Keep exposed e nds of
the vacuum and fuel lines free from dirt or debris.
WARNING! Failure to cover the intake opening with a clean towel could result in dirt or debris entering the engine. Dirt or debris
in the induction system can cause engine damage, which may necessitate a complete engine overhaul.
6. Remove all traces of the old gasket material from the intake manifold mounting flange.
DO NOT gouge the intake manifold sealing
surface during removal of old gasket material. Failure to remove all traces of the old gasket material will result in vacuum leaks that
will be difficult to detect later. Sealing flanges must be clean and dry before installation.
7. Remove the shop towels from the intake and vacuum out the intake channel to ensure no dirt or debris is left in the intake system.
Place a shop towel over the entire intake opening until you are ready to install the new
TERMINATOR™ EFI
TBI.
8.0
TERMINATOR™ EFI
TBI SYSTEM INSTALLATION
8.1 Throttle Body
NOTE: A 4 barrel intake is required for the installation of the Holley
TERMINATOR™ EFI
TBI system.
1. Install the four manifold flange studs (
Item 10 ) into the intake manifold. Install the throttle body gasket ( Item 9 ) between the manifold
and the 4 barrel throttle body injection unit. Check for sufficient thread engagement of the throttle body hold down studs and nuts.
DANGER! Check for proper clearance between engine components, such as the distributor, coil, etc., and the throttle body. If
any interference is found, correct the condition before continuing. Failure to do so can result in damage to the
engine components or the throttle body.
DANGER! Check for proper clearance between the air cleaner and the engine compartment cover hood. If any interference is
found, correct the condition before continuing. Failure to do so can result in damage to the compartment cover,
hood, or engine components.
2. Place the throttle body in position over the manifold flange studs with the
throttle lever located on the driver’s side.