Speedway Motors 9Super7 - Tri-Power In Under An Hour - Tech

It's a bit cluttered due to the placement of the fuel block on the driver side of the intake with the linkage behind but it allowed for the easiest routing of the fuel line from the stock mechanical fuel pump. We'll come back to this in a minute.

With the fuel lines removed, you can get a better idea of what the installed linkage setup looks like. Note that all three carb arms are clocked at the same ten o'clock setting. It's very important that they're parallel and cannot be opened over center, causing a potential stuck wide-open throttle situation. We bent a piece of tubing to clear the linkage and fuel lines, which attaches the throttle pedal linkage to the primary carb arm with a pair of heim ends.

This compression fitting is unique to Stromberg carburetors and enables 1/4-inch hard line to be used without flaring the tubing by using a ferrule to hold the line in place.

The passenger side, however, is much cleaner, with only the choke linkage, idle-screw assembly, and accelerator pump linkage visible on the three carbs. We topped off the trio of carbs with Tru-Helmet air cleaners to give the setup a classic, hot rod vibe.

This compression fitting is unique to Stromberg carburetors and enables 1/4-inch hard line to be used without flaring the tubing by using a ferrule to hold the line in place.

Another style compression fitting is the stainless steel one shown here. This will be at the opposite end of our fuel line, at the regulator. The compression end is 1/4-inch while the pipe fitting is 3/8-npt. Note the relation of the ferrule to the fitting.

A small ratcheting tubing cutter makes quick work of cutting the tubing to length. Here, 5/16-inch tubing is cut to run from the fuel pump up to the regulator.

Once cut, a deburring tool is used to clean up the edge and remove any debris.

We'll start at the back carb and work our way forward since this will basically be one piece from the regulator to the rearmost carb. Notice that I gave the linkage a wide berth so as not to interfere.