Installation Manual

Installation Instructions for:
SYSTEM #17119
1964-1972 GM “A” Body
12/4/14
Installation:
1) Raise the vehicle up on a hoist or rack to working height. If you do not have access to a hoist
or rack raise the vehicle and support securely with jack stands.
2) On the frame of the vehicle, slightly forward of the rear axle, there are a set of two mounting
holes on each side of the vehicle (use the two inner holes) which will be used to fasten the rear
muffler hanger mounts. Use these stock locations to secure hanger #298HA (64-67) or 290HA (68-
72) on the left side and hanger #297HA (64-67) or 289HA (68-72) on the right side. Use the 5/16” x
1” bolts and nuts provided. See Diagram #1.
3) Slide the two rubber isolators #HA168 onto the two hanger mounts that were installed in the
previous step. Slide the two clamp hangers #489HA into bottom holes of the rubber isolators. The
hanger rod should be inserted from the outside. Place the mufflers up into position with stands and
place the outlets of the mufflers into the clamp hangers. Tighten enough to hold in place but still
allow for adjustment.
4) Slide a clamp over each muffler inlet. Place H-pipe assembly #16008 in its approximate
position underneath the vehicle and connect the back of the H-pipe into the muffler inlets and support
with a stand. Tighten clamps just enough to hold but still allow for adjustment.
5) Place the right tailpipe #16155 in position over the axle on the right side of the vehicle. Place
the left tailpipe #16154 in position over the axle on the left side of the vehicle. When installing
tailpipes, the rear of the vehicle must be supported by the frame with jack stands, allowing the axle to
hang from the suspension. (Note: The car should be supported by the axle after the tailpipes are in
place.)
6) Bolt the tailpipe hangers #HA572 in the stock location on the rear quarter frame rails using the
5/16” x 3/4” thread cutting bolts, nuts and washers provided. Use the lower of the two factory holes.
7) Place hanger assembly #487HA over the rear of the right tailpipe and connect to the #HA572
hanger installed in the step above. Tighten the clamps enough to hold in place. Repeat this step on
the left side with hanger #488HA.
8) Insert the tailpipes into the muffler outlets and adjust the mufflers and tailpipes into their
approximate final position.
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