1955-57 dual turbo exhaust system installation

1955-57 dual turbo exhaust system installation
by Randy Irwin
Randy Irwin - Technical Writer
Randy has been involved in the Chevy
parts business for over 25 years. He is a wizard at creating, making and modifying custom
parts for Chevys.
Parts Needed:
Turbo 2” Exhaust System, Rams Horn w/Rack & Pinion
Left 2” Small Block Exhaust Manifold For Rack & Pinion
Chrome Small Block Exhaust Manifold Bolts
Stainless Steel Exhaust Manifold Studs & Nuts
2” Heat Riser Delete
To order parts call 1-800-456-1957 or visit ClassicChevy.com
An exhaust system is the easiest way to gain horsepower and change
the sound and entire impact of your classic car. There are many so called
“bolt on kits” on the market that claim a direct fit with no cutting, welding
or modifications. Most times when the kit arrives you find nothing more
than a pile of elbows, mufflers and pipes. These systems will fit anything
from a Pinto to the space shuttle.
The SCR exhaust systems that CCI carries are truly designed specifically
for your vehicle. The pipes are CNC mandrel bent which gives a perfect fit
every time. The mandrel-bent corners are not crushed like pipes formed
on an exhaust pipe bender. Our SCR kits are complete; all pipes, mufflers,
hangers, brackets, gaskets, donuts, flanges and clamps are in the kit. All
clamps and hangers, in both aluminized and stainless steel systems, are
made from rust-proof stainless steel. Installation of all of our turbo and
Flowmaster kits is very similar. This article will show the installation of a
small block rams horn system with the special left side exhaust pipe to
work with the CCI rack and pinion kits.
Tools Needed:
Time Frame:
Jack Stands
1/2” Wrench
9/16” Wrench
9/16” Socket and Ratchet
4 Hours
Photo #1: The
coupler shaft
for the rack and
pinion will not
allow the use of
a center dump
rams horn
manifold on
the driver’s
Photo #2: Using the 1969-72 Chevy truck rear dump rams horn
manifold P/N 18-414, it will be a breeze to connect an exhaust
pipe to the manifold. It looks like GM made this manifold just
for our application.
Photo #6: The
passenger side
exhaust manifold
always uses a heat
riser. A heat riser
P/N 24-01 or heat
riser delete P/N 2403 must be used to
properly space the
exhaust pipe so it
will line up with the rest of the exhaust system.
Photo #3: On the passenger side, there is plenty of clearance
between the rack and pinion and a standard 2” center dump
rams horn manifold. This manifold is readily available, used,
from any early 283 or 327 or P/N 24-297.
Photo #7a & 7b: The heat riser or heat riser delete is flat on one
side and concave on the other. The flat side fits the exhaust
manifold and the concave side fits the exhaust pipe donut.
Photo #4: The exhaust system includes two donuts, one gasket
for the heat riser and two flanges for the exhaust pipes. We are
installing new stainless steel studs and nuts P/N 18-178 in our
Photo #8a & 8b: The flat gasket included with the exhaust
system seals the heat riser or heat riser delete to the exhaust
manifold. With the heat riser or heat riser delete in place,
install the passenger side exhaust pipe leaving the three nuts
loose at this time.
Photo #5a & 5b: The exhaust
donut fits on the collar of the
exhaust pipe and seats on the ring of the pipe for a leak-proof
seal. The exhaust pipe flange includes a collar. When properly
installed, the collar fits the ring on the exhaust pipe. Install the
driver’s side exhaust pipe to the manifold leaving the three
nuts loose at this time.
Photo #9: Next, install the H-pipe. The front of the H-pipe will
slip up over the exhaust pipes and is held to the exhaust pipes
with a muffler clamps. This fully functional H-pipe improves
horsepower by equalizing the exhaust pulses as close to the
engine as possible.
Photo #10: Next,
install the
mufflers on the
H-pipe. The
mufflers are held
to the H-pipe
with the muffler
clamps included.
The forward inlet
of the muffler is
centered and the
rear outlet is offset. The mufflers slip over the outside of the Hpipe with the outlets oriented toward the frame.
Photo #11a & 11b &
11c: The muffler
hangers are held to the
frame using stock dual
exhaust muffler hanger
brackets, which are
included in the new
exhaust system. The
brackets are bolted to the frame using two existing 5/16” holes.
The new brackets come with two self-tapping bolts.
Photo #14a & 14b: The tailpipe hangers are held to the frame
using stock dual exhaust tailpipe hanger brackets, also included
in the new exhaust system. The brackets are bolted to the
frame just behind the rear shackle mounts using one bolt into
the frame. There are two holes in the frame; one for the
mounting bolt and one for the locating tab on the bracket.
Photo #15a & 15b: The tailpipe hanger has a rubber strap with
a steel tab to fit under the muffler clamp. Mount the hanger to
the rear of the bracket and using the supplied muffler clamp,
bolt the tailpipe in place. The tailpipes on the performance
systems run between the rear end and the shocks while stock
systems run between the shocks and the frame.
Photo #12: The muffler
hanger has a rubber strap
that bolts to the backside of
the muffler bracket and is
held to the outlet of the
muffler with a muffler clamp.
Photo #13:
The tailpipes
slip into the
outlets and
are held to
the mufflers
using the
same clamps
on the muffler
Photo #16: The tailpipes exit straight out the back of the car
under the bumper. If you like ‘57-style corner exit tailpipes,
those are available with the turbo and Flowmaster systems as
well. The tailpipes a redesigned to work with the CCI rear
shock bars and the new CCI coil-over shock conversion. With
everything in place and adjusted to your liking, the muffler
clamps and exhaust manifold studs may now be tightened. The
new system will give the car a whole new sound and will
improve low-end power and torque as well. Good Luck.
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