Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
ROCHESTER 4MC & 4MV 4-Barrel Carburetors: Description
The 4MC and 4MV carburetors are of a 2-stage downdraft design. The primary side has a triple venturi system. The secondary side is composed of 2 large bores using the air valve principle in which fuel is metered in direct proportion to amount of air passing through the secondary bores. A baffle is attached to the secondary side of the air horn above the main well bleed tubes to deflect incoming air to improve secondary nozzle operation on heavy acceleration. Model 4MC carburetors use a bowl-mounted choke housing with thermostatic control assembly. Model 4MV carburetors use an intake manifold mounted thermostatic choke control assembly with a connecting rod to carburetor.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.