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Fig.
6O-Corvttl~
Tnpl,
Carliurttllln.
three passage ports. Tbe surge tube maintains a balanced
fuel-air charge to each cylinder as required during engine
operation, resulting in smooth and
efficlt!nt
engine operation
and increased horsepowc:.r.
The basic exhaust manifold design consists of two outlets
instead of one, divided by an internal wall at the rear of the
heat box. When using the manifold heat control valve, the
exhaust gases from the front three cylinde" are directed to
the
heat valve in the heat box.
Pan
of these gases are then
directed by the valve to the intake manifold to preheat the
38
incoming
cbarge
during
warm-up. This portion of
the gases
then rejoins the
original
stream
to be expelled through
the
front exhaust pipe, right hand mufHer
and
tail pipe. The
exhaust
gases
from
the
rear three
cylinders arc carried
away by the rear
outlet and expelled through the left
han
tail pipe. However, it
has been determined that manifold
beat
control valve operation
is neither
necessary
nor
desir.
able under normal temperature
and operating conditions
encountered with
your Corvette. Consequently
a manifold
heat shield has
been installed between the exbaust and
intake manifolds
to direct exhaust gases from the fronl
three cylinders
away
from the
intake manifold,
thus
eliminating preheating
of the incoming charge. Also, the
heat control valve
spring
has
been reversed so as to
hold
the valve continuously in
a
Hheat~orr'
position.
Lf
preheat.
ing of the incoming charge is
desired for extreme cold
weather operation,
it
will
be-:
necessary
to remove
the
heat
shield and reverse the heat
conlrol valve
spring.
it
is
recommended that your
Chevrolet dealer be consulted
for
advice
concerning
this
modification. Where
it is advocated,
this modification
should be performed by your
dealer
who
is
beller equipped
to do
thi,
work.
The pistons used
arc
the
light~weight,
expansion-controlled,
aluminum type with the piston pin
offset by
~
inch.
This
feature reduces the possibilhy
of
piston
noise,
providing
a
quieter
engine
operation under all loading
conditions.
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