Offenhauser Triple Carb intake manifolds provide a nostalgic appearance while equalizing fuel distribution to all cylinders, improving both performance and economy. With this lightweight cast aluminum manifold, your old “Stovebolt” will be more responsive across the RPM range. Use with two carburetors (2-5/8″ bolt centers) typical of 1937-52 Chevys.

Fits 235 Chevy 6-cylinders
1937-52 engines w/ Manual Transmission
Carburetors

Speedway Motors now offers a reproduction version of one of the most popular carburetors ever used, the original Stromberg 97! Original equipment on 30s and 40s cars and trucks, the Stromberg 97 has long been favored by flathead hot rodders and racers who realized the performance qualities of this timeless fuel supplier.

There have been numerous attempts to reproduce this unit, with little success. “Speedy” Bill Smith of Speedway Motors in Lincoln, Nebraska, took on the challenge to make a great product even better. The 9 Super 7® Carb brings this reproduction of the original Stromberg 97 2 barrel carb into the 21st Century!

Speedway Motors has incorporated all of the improvements shown above while maintaining the carburetors original look. Features such as the choke assembly, accelerator pump, main jets and cosmetics have all been faithfully retained. Additionally, each carburetor is individually flow tested and inspected for leaks. Perfection is the result!

Aesthetically, the 9 Super 7® is nearly identical to the stock unit, minus the large 97 logo that appeared on the side and the patent numbers found on the float bowl area. Upgraded internal parts include; the float, needle, and seat. Jetting and power valve settings remain as they were for the original 97 carbs as well as the cfm and vacuum specs.

The other similarity that the 9 Super 7® shares with the original 97 is the setup and tuning necessary to yield a well-running machine. While perhaps not as simple as bolting on a single four-barrel, the 9 Super 7® makes setting up a multiple carburetor induction system easier than when Strombergs were available new. All thats required is an intake, a linkage system, a Uni-Syn syncing tool, and a little patience. Our 3 Carb kits come with one primary carburetor and two secondary carburetors while the 2 Carb kits are both primary carbs. See our Multiple Carburetor Tech Tip for more information on using the 9 Super 7® in a 2×2 or 3×2 carb tri power set-up.

On the primary 9 Super 7® carb the throttle shaft extends from carb body .983″ and has the hole on the end to pin the linkage. There is a brass sleeve that the throttle shaft rotates in that extends from the carb body .400 and this leaves the useable throttle shaft length of .583. There is sufficient room for progressive linkage and the manual throttle linkage that rotates over the sleeve.

Loïc Jr, [11/27/2023 2:44 PM]
Three Deuce carburetor setups come with two “secondary” carbs for front and rear intake position and one “primary” carb for central/middle position
All-new tooling for crisp, flawless castings
New aluminum base assembly allows for cooler fuel temps and better fuel efficiency as compared to the original cast iron design
Stainless steel screws and hardware
Features original Stromberg 0.97″ venturi diameter
Modern Nitrophyl float and Neoprene gaskets
Original troublesome needle and seat replaced by a Grose-style fuel inlet valve to better cope with higher fuel pressures and improved high speed running
Will not stick or dribble like the old Viton-tipped needle and seat setups
Grose-style jet valve wont corrode in modern fuel, something the original needle and seat units cant do
Comes with a No. 65 power valve and 0.045″ main jets, identical to the stock 97
Extended brass throttle shaft to simplify multi-carb linkage
Primary Carb – (1) Middle Position
Choke assembly, accelerator pump, and jets have all been faithfully retained and accept standard Stromberg parts
Secondary Carb – (2) Front and Rear Position
Special base plate with no idle circuits or choke linkage
Special butterflies and shafts installed
Works best with progressive linkage
Idle only off the center or main carburetor
No more plug foul
Note: The secondary carbs have NO choke, and they have NO idle system. Not recommended for use with Ethanol fuels.

Recipient of the NSRA 2009 Best New Product Award!
Recipient of the Goodguys Best New Product Award! – Engine and Transmission, Goodguys PPG Nationals 2009

Linkage Kit

This universal progressive throttle linkage kit is designed to work with Ford/Holley 94’s and Stromberg 97’s carbs. It can be slightly modified to also work with Rochester 2G/2Gc applications (the linkage arms must be drilled for the larger diameter shafts). The arms are drilled with numerous holes allowing you to adjust the opening rate (ratio) of the secondary carbs.

Maximum center to center of long shaft is 11-3/8″ and maximum of short shaft is 7″. Works great on Y-Block Ford, Chevy small block, Ford Flathead V8, Chevy W-Series, Pontiac Tri-Power, vintage Cadillac/Oldsmobile J2, and more! This mechanical accelerator linkage can be used for either two 2-barrel (2×2) or three 2-barrel (3×2) carburetor applications.

Adapter Kit

You’ve asked for it and here it is. No more scouring the junkyards to round out the new 2 or 3 carb setup on your Chevy 6. This kit comes complete with mounting hardware and gaskets.

(3) 1936-1962 GM L6 carb flange to 3-bolt, 2-barrel carburetor
Cast aluminum
Precision Machined
1 barrel bore measures 1.556″ with the ‘small pattern’ 2.675″ (2-9/16″) center to center bolt spacing
Includes nine studs, nine stainless steel washers, and nine stainless steel fiber lock nuts – enough for three carbs
(3) Three-bolt carburetor base gasket, fits Stromberg 97, Speedway 9 Super 7®, and Holley 94 carbs
(3) Fel-Pro 2-Bolt Carburetor base gasket for 216/235 CI Engines

Headers

Fenton® cast iron headers are one of the first steps to improved performance for your Chevy inline 6. These split manifolds are the only way to get that classic “rapping” exhaust note. For 1936-1959 Chevy 216, 235 and 261 straight 6 engines.

Does not include collector flanges, collector gaskets or exhaust manifold gaskets.

Manifold Heat Kit

When converting to tube headers or cast Fenton manifolds, pre-heating can lead to hesitation. This manifold heat kit eliminates the problem and helps your ride run as good as it looks.

A must-have when converting to tube headers or cast Fenton manifolds
Replace much-needed intake pre-heating to eliminate hesitation and dead spots
Includes all required hardware, tube, fittings, and gaskets
Early kit includes both 216 & 235/261 style gaskets
Kit Includes

(1) Offenhauser 1177 1937-52 Chevy 6-Cylinder Triple Carb Intake Manifold

(1) Set of 3 9 Super 7® 3-Bolt 2-Barrel Carburetors, Plain Finish

(1) 97/94/2G 2-Barrel Carb 3×2 Progressive Tri-Power Throttle Linkage

Loïc Jr, [11/27/2023 2:44 PM]
(1) GM ’36-62 L6 2-Bolt Small Pattern, 3 Stromberg 3-Bolt Adapter Kit

(1) Fenton® 1936-1959 Chevy 216/235/261 6-Cylinder Cast Iron Headers

(1) GM L6 Manifold Heat Kit, 216/235/261 Fenton Headers

Specs

Carburetor Port Diameter: 1-1/2″
Intake Port Diameter: 1.400″
Carb Bolt Center-to-Center: 2-5/8″
Speedy’s 9 Super 7® features .045″ main metering jets and a number 65 power valve, which is the same as a stock carb.
Includes base gasket.
3 Carb kits include one primary carburetor and two secondary carburetors
Note: There is no provisions for a vacuum advance line. Using stock vacuum advance style distributors will need an alternative place to connect the vacuum line.
Replacement Jet Access Plug Gasket = 91011542
Replacement Needle & Seat Gasket = 91011543
Our independent tests produced these flow numbers:

3″ of Vacuum – 60 CFM
10″ of Vacuum – 110 CFM
15″ of Vacuum – 136 1/2 CFM
28″ of Vacuum – 184 CFM