How to Set up a Dual Carburetor on a Chevy 235

Save

Adding a second carburetor on your Chevy 235 adds muscle to the stock six-cylinder engine. The job is not complicated, providing you have some wrenching expertise and talent for making things fit. The easiest part is bolting up a dual intake manifold and installing a second carburetor that matches the original, or installing bigger carburetors. The challenge is adapting dual fuel lines and dual carburetor linkage. Pull the old manifold and carburetor off and get a dual manifold that works with the exhaust headers. Decide on the engine upgrade you want and use a pair of matching carburetors.

Things You'll Need

  • Haynes or Chilton repair manual for your Chevy
  • Standard gauge tools
  • Dual intake manifold
  • Intake manifold gaskets
  • Torque wrench
  • Carburetor studs with lock nuts
  • Carburetor gaskets
  • 2 carburetors
  • Fuel pump adapter
  • Rigid fuel lines and fittings
  • Dual linkage

Manifold and Carburetors

  • Set up the dual intake manifold with two bolts in each flange and an intake gasket on the face of each flange. Position the manifold at the cylinder head and thread the bolts into the head by hand. Torque the bolts to 18 foot-lbs. each using a torque wrench.

  • Thread new carburetor studs into the holes at each side of the carburetor ports on the manifold. Place a new carburetor gasket atop each port on the manifold.

  • Remove the air cleaners from each carburetor and set the air cleaners aside. Turn each carburetor so the throttle linkages are facing in, toward the rocker arm cover on the engine.

  • Align the holes in each carburetor flange with the carburetor studs on a manifold port and set the carburetors in place on the intake manifold. Thread new lock nuts on each stud by hand. Tighten the nuts securely with an open-end wrench.

Fuel Lines and Linkage

  • Loosen the existing rigid fuel line fitting at the fuel pump and remove the rigid fuel line. Attach the dual fuel line adapter to the fuel pump and tighten the fitting.

  • Attach a length of rigid fuel line to each side of the adapter and tighten the fittings. Position the other end of each line near a fuel intake fitting at a carburetor. Thread each fitting into place on a carburetor by hand. Tighten the fittings with an open-end wrench.

  • Turn the throttle stop screws on both carburetors fully closed with a screwdriver. Back each screw out 1 1/2 turns as a preliminary setting. Position the dual throttle linkage at the outer edge of the carburetors. Connect each linkage rod to the corresponding throttle levers using linkage clips.

  • Attach the end of the dual linkage to the existing accelerator linkage in the engine compartment. Ask an assistant to push the accelerator pedal to wide-open and let up several times as you visually ensure that the linkage moves each carburetor throttle lever to full-throttle simultaneously.

  • Follow the procedures in your Haynes or Chilton repair manual and adjust the idle and fuel-air mixture on each carburetor. Adjust the throttle stops as described in the repair manual. Reattach the air cleaners on each carburetor.

References

  • Photo Credit Jupiterimages/Comstock/Getty Images
Promoted By Zergnet

Comments

You May Also Like

  • 1966 Chevy Inline 6 Cyl Engine Specs

    Three in-line six-cylinder engines powered Chevrolet cars and trucks in 1966. Known as the third-generation sixes, the 194-, 230- and 250-cubic-inch engines...

  • Chevy 235 Performance

    The Chevy 235 was part of the second generation of inline six cylinder engines that Chevrolet used from 1929 through 1999. Though...

  • How to Install a Holley Carburetor in a Chevy 350

    Holley carburetors are among the most widely used and recognizable high-performance carburetors on the market. The Chevy 350's stock Rochester was design...

  • How to Set Idle Screws of a Holley Carb

    Properly setting the idle screws on a Holley carburetor is one of the most commonly overlooked maintenance task. The idle screws determine...

  • How to Identify a 235 Chevy

    The Chevrolet 235 cubic-inch inline six-cylinder engine -- successor to the 216-cubic-inch -- entered full-production during the 1940s and continued until the...

  • How to Sync Dual Carburetors

    The procedure of synchronizing carburetors is relatively easy once the basic principle behind it is understood. In a dual-carburetor engine, both carburetors...

  • How to Set Up an Edelbrock Carburetor

    The Edelbrock carburetor is known for its easy setup and it is one of the most popular high-performance carburetors in automobiles. Edelbrock...

  • How to Hot Rod 6-Cylinder Chevrolet Engines

    The muscle-car era inspires images of powerful, iconic V-8s powering sleek cars down the road with a throaty grumble. However, many classic...

Related Searches

Check It Out

How To Travel For Free With Reward Points

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!