8.2 Throttle Body Installation
NOTE:
Remove and discard the special shipping bolt as shown in Figure 4. Apply a couple drops of Loctite to the long end of
the flame arrestor stud and insert into the throttle body and tighten securely. After the flame arrestor is installed it is
EXTREMELY IMPORTANT
that the flame arrestor stud does not extend any farther than 1/2 inch past the top cover of
the flame arrestor, damage to the engine cover or hatch may result. Trimming may be necessary.
Figure 4
1. Locate the three 5/16" studs and screw the coarse thread ends into the proper TBI adapter mounting holes.
2. Place the gasket and throttle body over the studs and tighten with locking nuts 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.
8.3 Throttle Connections
NOTE:
Some applications originally equipped with a Quadra-Jet carburetor may require the use of Holley’s throttle cable
bracket P/N 717-6.
NOTE:
Mercruiser applications will require the throttle cable bracket P/N 717-6 and Holley's linkage adapter P/N 717-7. Install
the bracket along with the proper gaskets between the manifold and the adapter plate.
NOTE:
Throttle extension bracket must also be used when the TBI is mounted over the secondary bores on stock small block
Chevrolet manifolds. Mount this to the 717-6 bracket using the two nuts and bolts that are provided. Or when the old
throttle lever arm is significantly longer then the Pro-Jection throttle lever arm. See step 2.
1. Remove any studs or brackets that are on the carburetor throttle lever and transfer them over to the lever of the TBI in the
same relative location. Connect the throttle cable to the lever using the original equipment hardware. If Using the Holley
717-6 and/or 717-7 throttle linkage kits. Follow the instructions that come with these kits. In some cases it will require the
use of the throttle lever extension brackets. Step two outlines the procedure for using the throttle lever extension bracket.
2. Measure the length of the throttle lever arm on the carburetor removed from the boat. Compare the length of the existing
throttle lever arm with the one on the
PRO-JECTION
throttle body. If the two throttle lever arms are similar in length (within
1/2” of each other), the throttle lever arm hole on the
PRO-JECTION
throttle body can be used without the extension
bracket. Use the throttle lever arm extension bracket if the old throttle lever arm is significantly longer than the
PRO-
JECTION
throttle lever arm. Before installation of the bracket, check the diameter of the throttle cable stud. Some Systems
may use a 1/4” stud that will require drilling of the appropriate hole in the extension bracket to a 1/4” diameter. Attach the
extension bracket using two fillister head screws. The extension lever length can be adjusted using the four sets of holes.
3. Attach throttle linkage and have an assistant get in the boat and fully actuate the throttle controls. Make the necessary
adjustments to the throttle linkage to ensure that the throttle plates are vertical when the throttle control is wide open. Work
throttle linkage back and forth several times to ensure it operates smoothly with no binding or sticking.
