- All Genuine 97 on the outside
- Totally new on the inside
- BIG 250cfm airflow - 55% more than a regular 97
- New power valve circuits improve fuel conditioning
- New ‘early plenum effect’ boosts top end power
- Ported distributor vacuum adds mid-range torque
- BIG S-jets accept 5/16in hard line
- Runs out of the box
The BIG97 Primary features 250cfm airflow with significantly improved
fuel circuits, and provides ported vacuum for your modern aftermarket
distributor. It can be used on its own, in multiples (with direct or
progressive linkage) or as part of the BIG97 Tri-Power.55% more airflow
move up to a 1.175in venturi with super-efficient 20 degree entry
angles. The accelerator pump discharge jets are smaller and well out of
the booster airflow. And flared exit cones build power by slowing the
mixture down to reduce turbulence into the manifold plenum. The result?
250cfm per carburetor.New power valve circuits improve fuel conditioning
top end enrichment directly into the emulsion tubes, BIG97 Primaries
significantly improve fuel conditioning for more top end HP on less
fuel. 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. Ported distributor vacuum
in the brass plug (supplied) and connect your distributor to improve
combustion efficiency in cruising mode. You'll run smoother and cooler,
with more torque and better fuel mileage. 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!
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
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 Primary jetting:
jets 0.056in Power valve #65 Accelerator pump valve #60 Note: This
jetting is designed for Primary use as part of the BIG97 Tri-Power.
Smaller jetting will be required when using BIG97 Primaries in
multiples. Choose your finish
BIG97s are available
in the full range of Stromberg finishes: Original Equipment style,
Chrome, Black & Chrome and Barn Find – all from stock. Choose your option
choke and LZ-style ‘push-throttle’ options are also available to
special order. Click the far right tab (above) for further information.
To order, please ask your Stromberg dealer.
Remember, like any
carburetor, BIG97s need proper installation and tuning for optimum
performance. Every BIG97 comes with full installation instructions and
you can find more help on our Tech Center.
carburetors are not designed to meet any emission requirements for 1968
and later applications. Therefore, they should be used only for
competition/off road vehicles or vehicles not required to comply with
late model exhaust emission standards. Original 97 style hand throttle
parts are not included.