We’ve got together with our buddy Charlie Yapp at Scalded Dog Speed Parts (and the early Ford four-banger dedicated ‘Secrets of Speed Society’, of course) to produce some cool linkages for early Ford Model A-based four-cylinder engines.
The new Stromberg TwoStep 9248S (direct) and 9248PRO (progressive) linkages are designed principally for use with the popular Scalded Dog Equalizer and Riley Two Port intake manifolds (both available from Scalded Dog Speed Parts), which set the carburetors five inches apart. The new TwoStep 9252S and 9252PRO linkages set the carburetors 9 5/8th inches apart to suit Burns, Zephyr and Roof 101 Cyclone intakes. Prices for all kits are highly competitive: $45.95 (or £24.96 + UK tax) for the S (direct) kits, and $99.95 (or £49.96 + UK tax) for the PRO (progressives).
Designed and manufactured exclusively by Stromberg Carburetor, the TwoStep linkage range combines clean, traditional looks with maximum leverage and huge versatility. Each kit comes pre-assembled and installs in just two simple steps, without the need for extended throttle shafts. Check out the following features:
- Die-cast zinc SuperLink lever arms. All other parts stainless steel.
- Every kit comes with new Stromberg ‘Snapback’ throttle return springs, which wrap around the end of the throttle shaft. These chemically blacked, stainless steel torsion springs snap the carburetors shut, yet virtually disappear from view.
- TwoStep progressive systems are designed to ensure optimum performance and maximum versatility. The long primary lever has three mounting points so you can change when the secondary carburetor opens, and you can pull the front carburetor or push the rear one open to suit individual applications. On the top setting (as supplied), the linkage will start to open the secondary carburetor at around 50% throttle. Lower holes will open the secondary carburetor sooner.
- To improve leverage, the primary (center) arm was kept as long as possible without hitting the carburetor S-jet. It also has a bigger clamping screw to handle more linkage torque. The sliding progressive rod meets the secondary carb rod at the top of the lever arm – not part way down like some systems. Effective leverage is especially important as 97 multi-carb systems have strong spring resistance.
- The neat tapered rod stops are fully adjustable, with discreet set screw fixings.
Just one warning, I’m afraid: Like most progressive linkage systems for Stromberg carburetors, the TwoStep progressive linkages cannot be used with banjo fuel fittings (eg. Stromberg 9082K and 9083K). The banjo and its fuel hose interfere with the long (primary) linkage arm causing linkage binding or sticking. You can use our 9080K hose ends instead, of course, leading your hoses to a firewall-mounted 2-outlet fuel manifold block.
We wouldn’t be responsible if we didn’t ask you to read the instructions before installation, of course. Luckily, (and unlike most other linkage suppliers) Stromberg TwoStep linkages all come with full instructions.
Hey I drive a 1930 Model A Ford banger and having a WAC custom single downdraft intake made (Charlie’s all out of stock) Love to run Big97 single in black with choke option for cable choke. Engine is stock but have plans for High compression head all ready has FSI ignition, do you make linkage that will connect to stock model a linkage. What would you recommend for jets?
Steve, We are selling a few BIG97 Primary models to 4-banger guys, one of whom improved his top speed at the UK’s Pendine sands run this year. I am pretty sure that the stock Model A linkage connects to a 97, even though it is in a higher position. We will look out some pics and email one to you. Predicting jets is tricky but you may have to down-jet a little. The BIG97 Primary has bigger jets than a regular 97 but that’s in proportion to the bigger airflow. I’m afraid we have never tested this ourselves so you will have to get it on the car and see. It won’t be far out..Thanks.