4. Disconnect and plug the inlet fuel line that runs from the gas tank to the fuel pump. This will prevent fuel spillage and
foreign matter or dirt from entering the fuel line.
DANGER! BEFORE DISCONNECTING OR REMOVING FUEL LINES, ENSURE THE ENGINE IS COLD. DO NOT SMOKE.
EXTINGUISH ALL OPEN FLAMES. AN OPEN FLAME, SPARK, OR EXTREME HEAT NEAR GASOLINE CAN
RESULT IN A FIRE OR EXPLOSION CAUSING PROPERTY DAMAGE, SERIOUS INJURY, AND/OR DEATH.
5. The fuel delivery system can now be removed. Holley recommends removing the mechanical fuel pump, if so equipped,
and blocking-off the fuel pump mount using the provided fuel pump block off plate. The PRO-JECTION system kit includes
a block-off plate that will fit small and big block Chevrolet and Chrysler engines. If the block-off plate does not fit your
engine, a block-off plate may have to be purchased from a local performance parts supplier.
6. If required, replace the intake manifold at this time. Proceed to step seven if this is not required. A 4-BARREL STOCK OR
AFTERMARKET INTAKE MANIFOLD IS REQUIRED FOR THE INSTALLATION OF THE HOLLEY DIGITAL PRO-
JECTION.
7. Place clean shop towels or rags into the manifold opening to prevent dirt or debris from entering the engine. Keep exposed
ends of vacuum and fuel lines free from dirt.
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.
8. Remove all traces of the old gasket material from the TBI mounting flange. DO NOT gouge the intake manifold sealing
surface during removal of old gasket material. Failure to remove all traces of old gasket material will result in vacuum leaks
that will be difficult to detect later. Sealing flanges must be clean and dry before installation.
9. 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 shop towel over the entire intake opening until you are ready to install the new PRO-JECTION TBI.
8.0 INSTALLATION OF THE MARINE PRO-JECTION FUEL SYSTEM
8.1 Adapter Plate Installation
Determine which type of mounting flange you have on your intake manifold. A square flange accepts a standard Holley
carburetor or universal, and a spread bore flange accepts a Rochester Quadra-Jet carburetor. Make sure the gasket surface on
the mounting flange is clean and any old gasket material has been removed. After determining the mounting flange
requirements, find the appropriate installation listed below.
8.1.1 Square Flange Manifolds
1. Using Figure 2 as your guide, place the square-holed gasket and then the manifold adapter on the manifold. The square
opening of the adapter should be facing downward and the wide opening should be facing upward toward the FRONT of the
engine.
2. Check to ensure that the gasket lies flat and adequately covers all surfaces.
3. Put the gasket and then the adapter over the manifold adapter. Position the bores, so they are placed forward toward the
primary bores of the manifold.
4. Insert the four 1-3/4" adapter bolts through the outer holes of the adapters and gaskets and into the manifold. Torque the
bolts to 15 ft./lbs. in two steps. First, torque each to 8 ft./lbs., and then to 15 ft./lbs. in a criss-cross pattern.
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