STROMBERG BIG 97 SECONDAR CARBPLAIN 250CFM

Description

The BIG97 Secondary
carburetor is designed ONLY to
be used in multiple carburetor
systems, connected to a BIG97
Primary with a progressive
linkage. BIG97 Secondaries
have no power valve or
accelerator pump circuits, but
keep chokes, idle and
transition circuits for steady
idle and good low throttle
manners. Dummy accelerator
pumps retain the classic 97
look.

55% more
airflow
BIG97s
move up to a 1.175in venturi
with super-efficient 20 degree
entry angles. And flared exit
cones build power by slowing
the mixture down to reduce
turbulence into the manifold
plenum. The result? 250cfm per
carburetor.

New
‘early plenum effect’ boosts
top end power
Allowing all cylinders to
draw from both barrels gives
you dual-plane drivability
with a single-plane style top
end
horsepower.

BIG
S-jet twin-ball inlet
valve
Accepts
big diameter 5/16in hard line
(regular 97s take only 1/4in
line), plus regular Stromberg
fuel
fittings.

All
Genuine 97!
Everything that makes the
Genuine Stromberg 97 so
popular is built into the
all-new BIG97. From the cast
iron base to the reinforced
air horn casting and
everything in
between.

Runs
out of the box
BIG97s come ready to run
with the following jetting
(see below). As with any
carburetor, rejetting may be
required for other
applications, high altitude,
local gas, ethanol content and
more. A wide range of jets and
power valves is
available.

BIG97
Secondary jetting:

Main jets 0.061in No
Power valve. No Accelerator
pump valve

• All
  Genuine 97 on the
  outside
• Totally new on
  the inside
• BIG 250cfm
  airflow – 55% more than a
  regular 97
• New
  ‘early plenum effect’
  boosts top end
  power
• BIG S-jets
  accept 5/16in hard
  line
• Runs out of the
  box.
• Use ONLY in
  multiple carb systems,
  connected to a Primary with a
  progressive linkage