JBA 36611S User Manual

Installation Instructions

and Warranty Information

For JBA Headers 1965-1973

289/302 Mustang

NOTE: This application is for vehicles with factory power steering. You will need a new

bracket to lower the power assist ram mount on the frame.

Use JBA bracket part no.6656B or equivalent

P/N 6610S, 6611S

Read all instructions carefully before attempting installation.

Rev. 12/06

Installation instructions for JBA Cat4ward® Headers P/N 6610S

1965-1973 Mustang 289/302

NOTE: Installation of this product requires an adequate workspace, general mechanic’s

tools, general mechanical “know-how” and a reasonable degree of experience. Most auto
enthusiasts with these resources will have little difficulty installing these headers. However,
you should carefully read these instructions before attempting to install these headers. If in
doubt, consult a professional mechanic. (Better to do it now than to get stuck halfway
through the installation.) This part is certified for use on Emission Controlled Vehicles.

By installing your JBA Performance Exhaust product, you indicate that you have read this
document and agree with the following terms.

The Purchaser is responsible for following all installation instructions and safety guidelines
supplied with JBA Performance Exhaust products.

JBA Performance Exhaust assumes no responsibility for damages resulting from improper
operation, misuse, abuse, or lack of responsible care, or any problems resulting from
incompatibility with other manufacturer's products.

Included with your installation instructions is a copy of the product warranty. Please read it
carefully before you begin any work on your vehicle. Should you have any questions about
the warranty policy or installation, please give JBA a call at 619 229-7797.

JBA uses sealing beads on all its headers. We have found that when installed correctly the
raised bead around each port increases the pressure exerted on the gasket directly adjacent
to the port and effectively prevents leaking gaskets. It is important when installing the
header, to install all bolts loosely, then tighten evenly to ensure the flat installation of the
flange. It is normal for the flange to be raised off the cylinder head the thickness of the
sealing bead.

To prevent leakage, it is important to tighten the flanges on any set of JBA headers carefully
by using the proper procedure. The torque sequence from one flange to another will vary,
but generally every bolt on a header should be first fit snug, starting from the inside of the
flange working out, so that the bolt connects the flange to the manifold to the point where
they barely touch. Second, using the same inside-out pattern, tighten each bolt until

finished. This method will help prevent leakage and will give the user the best possible
performance out of their pair of headers. Below is the proper torque sequence for your
particular set of headers:

NOTE: These headers are designed to clear factory power steering. You will need a new

bracket to lower the power assist ram mount on the frame. Use JBA bracket part no. 6656B
or equivalent.

1. Place vehicle in a location where the floor is solid and flat, with adequate lighting. Do
not attempt to work on a hot engine. Heat causes metal to expand and makes
removal of fasteners difficult at best. Disconnect the battery cables from the battery.
Raise the front of the vehicle to obtain adequate access to the bottom exhaust
manifold flanges. Use large-base jack stands to support the vehicle. Do not rely on

the jack! Block the tires to prevent the vehicle from rolling off the jack stands.

2. Disconnect the spark plug wires by grasping and gently twisting the spark plug wire

boots. Do not pull on the wires! Brush or blow any debris, which may have collected
around the manifolds or spark plugs. This will help prevent foreign matter from
entering the combustion chamber when the manifolds are removed. Spra y WD-40 or
some type of penetrating oil on all accessible fasteners and fittings before attempting
to remove them.

3. Typically the exhaust pipes in these early vehicles are corroded to the extent that
they are difficult to modify for use with headers. These instructions contemplate the
removal of old components and the installation of a new exhaust system by an
exhaust shop. These instructions cover only the installation of the headers. The
necessary exhaust system modifications should be left to an exhaust shop.