1950-59 Chevy Inline 6 Dual Carburetor Kit

Intake Manifold

Offenhauser Dual 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 "big base" carburetors (2-15/16" bolt centers) typical of 1954-62 Chevys.

• Fits 216-235-261 Chevy 6-cylinders
• 1950-1959 engines w/ PowerGlide
• 1953-1959 engines w/ Manual Transmission

Included linkage kit is "non-progressive," meaning both carbs operate at the same time.

 

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. Be sure to include the Secondary 9 Super 7® when installing multi-carb setups. 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 2x2 or 3x2 carb 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.

• 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
• Choke assembly, accelerator pump, and jets have all been faithfully retained and accept standard Stromberg parts
• 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
• Perfect for use with our dual carb intake manifolds for Ford Flatheads

Note: 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

 Adapters

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. 

• GM L6 'big pattern' carb flange to 3-bolt, 2-barrel carburetor
• Cast Aluminum
• GM 1963-1975
• Precision Machined
• 2-Barrel, 3-Bolt Flange for 3-bolt, 2-barrel carburetor application
• 1 barrel bore measures 1.556" with the 'big pattern' 2.94" (2-15/16") center to center bolt spacing

 Kit Includes

(1) Offenhauser 1035 1950-1959 Chevy 6-Cylinder Dual Carb Intake Manifold

(1) Pair of Primary 9 Super 7® 3-Bolt 2-Barrel Carbs, Plain Finish

(1) GM '63-75 L6 2 Bolt to Stromberg 3 Bolt Carburetor Adapter

(1) Fel-Pro 9249 Carburetor Base Gasket, 230/250 CI Engines

(1) Three-Bolt Carb Base Gasket

(1) Three Bolt Carb Mounting Stud Kit

(1) Stromberg 97-Style Extended Throttle Shaft Arm

(1) Stromberg 97-Style Center Carb Throttle Shaft Arm

(1) 2x2 9Super7-Linkage Hardware

(1) Swedged Aluminum Throttle Linkage Tubes, 3/16 Inch (10-32) Thread

Installation Guide (PDF)

9 Super 7® Linkage Instructions (PDF)

915-11657 9 Super 7® Carb Instructions (PDF)

Multiple Carburetor Tech Tip (JPG)

• Carburetor Port Diameter:   1.700"
• Intake Port Diameter:  1.550"
• Carb Bolt Center-to-Center:  2-15/16"
• Head port flange:
  
  • 2.468" (2 7/16") Front to Rear
  • 2.315" (2 5/16") Top to Bottom
• 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