STAGE I IMPRESSOR KIT

IMPRESSOR KIT...

88 Horsepower Increase

STAGE I

"Bolt On" 17 Horses With 4-barrel

735 cfm Carburetor and Aluminum Manifold

Let's get some good air inside the engine where it can do some good. The factory carburetor is okay for stock per\-formance, but can't cut it when we start to build for the future. So our first step in Stage 1 is to drop on a big 4V Holley CARBURETOR C9AZ-9510-N. When you open its big doors your 390 can gobble up 735 cfm of the good air. This carburetor features "center pivot" floats that prevent fuel starvation while cornering. For maximum performance, the carburetor may have to be recalibrated as described on pages 13 and 20-21.

To make sure the good mixture from the big Holley gets good treatment on its way to the cylinders, install ALUMINUM INTAKE MANIFOLD C6AZ-9424-H. This is similar to the manifold used on 428 Police Interceptors. It has the same 180^° , dual plane design as the cast iron version for good low to mid-range response. Of course it provides better breathing, it's lighter and costs a little more. If you don't mind carrying around the extra iron, you can save some coin by installing the stock 428 CAST IRON INTAKE MANIFOLD C8OZ-9424-B which is almost as good.

Horsepower output with this induction setup starts im\-proving at 3500 rpm and increases to a maximum gain of 17 bhp @ 4500 rpm.

ADDITIONAL PARTS REQUIRED

WITH ABOVE CARBURETOR AND MANIFOLD

Part Number	Description	Remarks and Why Required
C5ZZ-9600-W	Air Cleaner	Use if necessary to clear hood
370970-S8	Air Cleaner Stud	Not supplied with carburetor
C8AZ-9A589-G	Carburetor Spacer	Thinner than stock because of higher intake manifold
C6AZ-6869-A	Road Draft Tube Cover	Use on pre-emission designed Vehicles
COAE-6A632-A	Draft Tube Gasket	Use on pre-emission designed Vehicles
C5AZ-8555-A	Water By-pass Tube	Press-fit design can't be interchanged with manifolds
C6AZ-6A630-D	Intake Manifold Baffle	Use w/C6AZ-9424-H Alum. Manifold
C8AZ-6A630-B	Intake Manifold Baffle	Use w/C8OZ-9424-B Iron Manifold
C6AZ-9433-B	Intake Manifold Gaskets	Use with either manifold
C6AZ-6052-A	Cylinder Head Plug	To plug hole if engine not equipped with emission control (8 req'd)