Corporate Ofce: PerTronix Inc. 440 E. Arrow Highway, San Dimas, California 91773 * Phone 909.599.5955 • FAX 909.599.6424
Installation Instructions
and Warranty Information
Part # 6651S 1965-1970 Mustang
6651S
WARNING: The product accompanying this document is legal only for off-highway use (except in California or
states that have adopted California emission standards), racing use or for use on pre-emission-controlled motor
vehicles/motor vehicle engines (pre-1966 domestic vehicles certied to California standards, pre-1968 domestic
vehicles certied to federal standards and all pre-1968 foreign vehicles), per the manufacturer’s application guide.
Read all instructions carefully before attempting installation.
Rev. 06/11
PerTronix© thanks you for choosing JBA HEADERS, the best tting, highest quality
header on the market. In order to realize the full potential of our good t, 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 num-
ber will be stamped on the engine ange. 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 conguration 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 ange to be raised off the
cylinder head the thickness of the sealing bead. It is important when installing the header, to in-
stall all bolts loosely, then tighten evenly to ensure the at installation of the ange. The torque
sequence from one ange to another will vary, but generally every bolt on a header should be
rst t snug, starting from the inside of the ange working out, alternating from top to bottom so
that the bolt connects the ange to the manifold to the point where they barely touch. Second,
using the same inside-out pattern, tighten each bolt until nished. 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 difculty installing these headers. However, you should carefully
read these instructions before attempting to install these headers. If in doubt, consult a profes-
sional mechanic. (Better to do it now than to get stuck half-way through the installation.)
1. Place vehicle in a location where the oor is solid and at, with adequate lighting. Do not
attempt to work on a hot engine. Heat causes metal to expand and makes removal of fasteners
difcult at best. Disconnect the battery cables from the battery. Raise the front of the vehicle to
obtain adequate access to the bottom exhaust manifold anges. 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 ttings before attempting to remove them.
3. Typically the exhaust pipes in these early Vehicles are corroded to the extent that they are difcult to modify for use with headers. These instructions contemplate the removal of old compo-
nents 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 modications should be left to
an exhaust shop.
4. Unbolt the Driver’s side exhaust manifold and remove. Using a small wire brush or similar
instrument, clean any carbon deposits left on the head.
5. Apply anti-seize to the header bolts. (Small head 3/8” x 1” bolts & lock-washers included.).
Apply a thin coat of high temp sealant to both sides of the header gasket (Gasket Included).
Permatex Ultra-Copper High-Temp Sealant is recommended. Use of a sealer that is not designed
to be used with O2 sensors will cause O2 sensors to become inoperative. (Also note that if exces-
sive sealant is applied, clumps may fall into the exhaust system and potentially clog the system.)
Bolt the header to the head. Torque to factory specications. Don’t forget the lock washers.
6. Unbolt the passenger side manifold and remove. As with the Driver side, apply anti-seize,
sealant and bolt the header to the engine.
7. Reinstall the spark plug wires and looms taking care not to let any wires rest against the header
tubes. Reinstall the battery cable. Make sure all rubber hoses and wires are kept away from the
headers. Otherwise, the heat will damage these components.
8. After the exhaust modication have been made to adapt the headers to your exhaust system,
recheck everything! Make sure all bolts are tight.
9. Start the engine and let it warm up. Check for leaks. Shut engine off and let it cool down.
Check to make sure all fasteners are tight.
10. Periodically check and retighten the header bolts.
Parts List:
(1) Driver’s Side Header Assembly
(1) Passenger’s Side Header Assembly
(16) 3/8” x 1” header bolts & lock washers
(2) Header gaskets (Header to Head ange)
(Starter tubes on some models)
LIMITED ONE YEAR WARRANTY
All JBA HEADERS and exhaust products are guaranteed, to the original purchas-
er, to be free of defects in materials and workmanship for one year. This warranty
covers the replacement or repair of the product only and does not cover the cost
of removal and installation, customer applied aftermarket coatings or any discolor-
ation or corrosion of nished surfaces.
Damage or product failure resulting from collision, improper installation, off-road
use, road hazards, the use of exhaust insulating wrap or like products or rust oc-
curring after installation, is not covered by the warranty. The warranty extends only
to the original purchaser.
Should a part become defective it should be returned to the original selling retailer
and must be accompanied with the sales receipt. If there is no retailer in your area,
call the factory for a return authorization and return your part prepaid to the factory
for inspection. PerTronix reserves the rights to replace or repair the alleged defec-
tive part and return the part freight collect.
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