PerTronix JBA Exhaust 6400S - Manual (Page 3)

Note: Installation of these headers requires welding.
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, 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.
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. Spray WD-40 or some type of penetrating oil on all accessible fasteners and fittings before attempting to
remove them.
3. Start by unbolting the factory exhaust from the catalytic converter assemblies and move it back a few
inches.
Driver side:
4. Support the engine using a floor jack with a block of wood under the oil pan. Use caution when doing
this as you are going to remove the motor mount and need to make sure the engine will not shift.
5. With the engine properly supported, unbolt the two bolts attaching the mount to the frame and 4 bolts
attaching it to the engine block. Now lift the engine approx.1 ”.
6. With the engine raised, loosen the (4)screws attaching the heat shield to the factory manifold.
7. Remove the 02 sensor from the factory manifold.
8. With the 02 sensor out of the way, remove the heat shield. It will not come out easily. Extreme force may
be required.
9. Next, remove the nuts attaching the factory manifold to the cyl. head. Be careful, the nuts round off
easily.
10. Remove the manifold/cat assembly from the truck.