What size carb do I need for a 350?

A 600-cfm carburetor may perform quite well on a stock 350 Chevy. However, the minute you start weaving in power adders like a hotter cam, a dual-plane performance intake manifold, and aluminum heads you’re going to need 700-750 cfm.

What is a 4150 style carb?

Often referred to simply as the “double pumper,” the 4150 and 4150-style carburetors fuel-feed inlets and a second full metering block on the secondary side, giving it dual accelerator pumps.

How do I know what size carburetor I need?

The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456.

  1. Example: Using a 355 CID engine x 5,500 max rpm = 1,952,500.
  2. Take 1,952,500 x .85 = 1,659,625.
  3. Then 1,659,625 ÷ 3456 = 480 CFM.

What’s the difference between a Holley 4150 and 4160 carburetor?

These two are very similar with the primary difference that the 4150 uses a thick metering block in both the primary and secondary while the 4160 is shorter in length and uses a thin, metering plate on the secondary side.

Is a Holley 4150 a square bore?

Holley 0-4779C Model 4150 Double Pumper 750 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor.

How do I know if my carburetor is too small?

If the carburetor is too small, it restricts airflow into the engine. The cylinder can’t fill up all the way. This starves the engine and results in slow acceleration and a lack of top-end power. A larger displacement engine running at higher rpm will require more air and fuel.

What are the specs of a 4150 hp carburetor?

Holley® HP 4150 standard specifications. Holley® 4150 HP ® carburetors have no choke tower. The main body uses a radiused air entry. The carburetor identification number on the HP series are stamped into the linkage side of the main body.

What size carburetor do I need for a 350ci engine?

For example, if we were to run a 350ci engine at 6,000 rpm through this equation, the formula would tell us that a 350ci engine requires a 608-cfm carburetor. However, most 350ci engines do not produce 100 percent volumetric efficiency, even at peak torque. They more likely produce around 85 percent as a strong street/strip engine.

What happens if you change the size of your carb boosters?

Changing the size of the boosters can have a dramatic effect upon the carb signal. Basically, the larger the booster “banjo,” the higher the carb signal will be. Obviously, as the banjo becomes larger, it restricts the CFM of the carb more severely.