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Secondary 9 Super 7 3-Bolt 2-Barrel Carburetor, Plain Finish

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Specs
Sold in Quantity:
Each
Fuel Type:
Gasoline
Carburetor Barrels:
2
Choke Type:
No Choke
CFM:
184
Bolt Hole Pattern:
3-Bolt
Gasket(s) Included:
Yes
Secondary 9 Super 7 3-Bolt 2-Barrel Carburetor, Plain Finish
VIDEO
Secondary 9 Super 7 3-Bolt 2-Barrel Carburetor, Plain Finish

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Details

Reviews (2)

Q & A (2)

What's in the Box

Info

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.

For years customers have been either putting up with poor idling multiple carburetor set-ups or spending hundreds of dollars converting the secondary carburetors so they did not have to idle circuits. Now Speedway Motors is offering our popular 9 Super 7® two barrel "secondary" carburetor with all that work already done. No more wasted money!

Speedway Motors has incorporated all of the improvements shown above while maintaining the carburetor's original look. Features such as the 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 9Super7 Carb 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 that's required is an intake, a linkage system, a Uni-Syn syncing tool, and a little patience. Be sure to include the Primary 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.

  • 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
  • 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 won't corrode in modern fuel, something the original needle and seat units can't 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
  • 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: Not recommended for use with Ethanol fuels.

Notes

  1. Features .045" main metering jets and a number 65 power valve, which is the same as a stock 97 carb.
  2. Replacement jet access plug gasket use # 91011542, replacement needle & seat gasket use # 91011543.
  3. Includes base gasket.
  4. The 9 Super 7® will operate suitably with fuel pressures ranging from 1-1/2 psi to 4 psi, with a desired setting of 2-1/2 psi to 3 psi. Fuel pressure from 4 psi to 7 psi will cause the carburetor to run excessively rich and may cause flooding. Flooding or leaks caused by excessive fuel pressure do not indicate a faulty carburetor.
  5. There are no provisions for a vacuum advance line. Ford & Mercury engines 1949-1953 using stock distributors will need an alternative place to connect the vacuum line.
  6. 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
Learn more about setting up 3 x 2 carbs using the 9Super7® Carb in Street Rodder Magazine's tech article, Speedway Motors Stromberg 97 - Tri-Power In Under An Hour.
 

See what other industry experts are saying about the 9 Super 7® here.

Customer Reviews

Rated 4.5 out of 5 by 2 reviewers.
RATING BREAKDOWN
2 reviews
5 Stars
1
4 Stars
1
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

badvolvo
Verified Purchaser
Verified Reviewer
tonganoixe ks

pretty sweet

March 14, 2016
Had an issue with gas leaking. Speedway quickly sent me a replacement. I used these on the tri power small block set up. overall, very pleased.
No, I would not recommend this product.
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Was this review helpful? 0 0

RockinRodder
Verified Purchaser
Upper Michigan

So far so good.

March 27, 2015
Not having used them yet...I'm no judge of performance...but they look good....installation is a breeze. All the moving parts look fine...albeit the center carburetor seems to require a little more effort to operate the throttle linkage than I think it should. The center carburetor has no vacuum port for a vacuum advance and no choke linkage to operate the choke via a cable run inside the vehicle. Those things, in my opinion need to be addressed. So far, they look great, like three soldiers, sitting on the bench waiting to do their duty.
Pros:
  • Look Great, Good price
Cons:
  • no choke linkage, no vacuum port.
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

2 questions : 2 answers

1 answers

Hi, Do these have vacume power valves or mechanical and would they suit a stock 351 ford cleavland with triple set up, Thanks William

Australia
March 03, 2012

Hi, Do these have vacume power valves or mechanical and would they suit a stock 351 ford cleavland with triple set up, Thanks William

Answers

March 07, 2012
John
Part number 91511656 These secondary carburetors have different base assemblies and NO idle circuits. Extended throttle shafts for hook up to progressive linkage. Internal valving is mechanical and no choke hook up provision. These carburetors are 3 bolt pattern mounting and you will need to match to your existing manifold. We also offer the primary carburetors so appearance would be the same.
1 answers

I have a 1950 F1 Will this work on the stock intake???? Will the stock air filter {oil bathed) work also???

biker 42
va
September 24, 2015

I have a 1950 F1 Will this work on the stock intake???? Will the stock air filter {oil bathed) work also???

Answers

September 28, 2015
John
Expert
The secondary carb will not work as a single carburetor on your original 1950 F1. You will need a primary under number 91011655 which has the idle circuits. Your air cleaner should work without issues but your original linkage is likely to run to the passenger side and these carburetors are designed with the throttle linkage on the drivers side.
Page 1 of 1

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