PerTronix JBA Exhaust 1655S - Manual (Page 2)

PerTronix© thanks you for choosing JBA HEADERS, the best fitting, highest quality header on the market. In order to real-
ize the full potential of our good fit, please read and understand these instructions completely prior to starting work.
Check to make sure you received the proper parts for your application. The header number will be stamped on the engine
flange. If you are unsure you have received the proper parts call before you start work.
Be sure to work safe! Whenever you work under the vehicle be sure that it is located on level, solid ground and is supported
by adequate safety stands! Remember: Hot asphalt will not support most jack stands!
Many factors affect the installation of headers, some of which are broken or aftermarket motor mounts, accidents that impact
the configuration of the frame, and/or the installation of different engines or aftermarket cylinder heads.
Attention Customers breaking in new engines: Due to the extreme heat generated during the break-in process, the appearance
of the ceramic coating may be altered in certain areas. The protection characteristics and thermal barrier properties of the
coating is never compromised. It is recommended that a cast iron manifold or old set of headers be used for this process.
Notice: The coating of these headers can be marred or scratched during installation. If the header needs to be returned and is
damaged, you will be charged for recoat.
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 normal for the flange to be
raised off the cylinder head the thickness of the sealing bead. It is important when installing the header, to install all bolts loosely, then
tighten evenly to ensure the flat installation of the flange. 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, alternating from top to bottom 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. Installation of these headers requires an adequate work space, 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 half-way through the installation.)
NOTE: • 64 1/2 -65 Cars must update motor mount frame bracket to a 66 and later frame bracket
• Must use D0OZ-6038-G motor mount or Sealed Power #270-2286 for proper clearance.
• Aftermarket bell housings will require clearancing for tubes
• Header flange needs to be clearanced when used with head studs or head bolts with hardened
washers.
• Shock tower width must be a minimum of 33 3/4”. It is recommended that a C5ZZ16A052E
Style “Export Brace” be installed to maintain that clearance
• 90º spark plug boots recommended on all cylinders.
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 negative battery cable from the battery. Raise
the front of the vehicle and remove the front tires 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. Spray 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 long gone. These instructions assume the removal of all old components and
the installation of a new exhaust system from JBA or by a competent exhaust shop. JBA manufactures a wide variety of H Pipes and
exhaust systems to work with these headers. Contaact your JBA Dealer for more information.
4. On stick Shift cars, remove the Clutch equalizer bar “Z-bar ”and lower rod *Note there were several different Z-bars used on the
Mustang. See explanation on next page.