Holley pro-jection 2D - Universal and Spread Bore Manifolds

Figure 2 Figure 3
8.1.2 Universal and Spread Bore Manifolds
WARNING! If using an aftermarket manifold on a Chevrolet small block, position the adapter bores so they are forward
toward the front of the manifold. On all other applications with any type of manifold, stock or aftermarket,
position the adapter bores so they are forward toward the front or primary bores of the manifold. On
factory big block Chevrolet manifolds, the throttle body must be mounted forward even though the bores
don't line up properly. This must be done to prevent the front cylinders from running lean.
1. Using Figure 3 as your guide, put the gasket and then the adapter on the manifold.
NOTE: On a small block Chevrolet application with stock intake manifold, position the adapter so the bores are over the large
secondary bores in the manifold.
2. Check to ensure that the gasket lays flat and adequately covers the sealing surface.
3. Insert the four 1-1/4" adapter bolts through the inner holes of the adapter and gasket 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.
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.
WARNING! The universal manifold adapter has six-threaded TBI mounting holes and only three of these will be used
to mount the TBI. Plug the remaining holes by applying a couple drops of Loctite to each plug and insert
into the unused holes. Use a 5/32 hex wrench and screw each plug in until the sit below the adapter plate
surface.