How do I know which Holley carburetor I have?

It’s like a “VIN” for your carburetor and should be hand-stamped on the front of the choke tower to the right of the vent tube on most typical Holley carbs. The list number typically is four to six digits long and may or may not have a suffix number behind it. The date code will be right below it.

How do I know what CFM my Holley carb is?

Will a bigger carb make more power?

1. Performance Improvements stocks carbs from Holley Performance, Edelbrock and Proform Parts.
2. The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456.

How do you read the date code on a Holley carburetor?

Decoding them is as follows:

1. Three Digit – Example 763 > 7 – Year (1967) , 6 – Month (June) , 3 – (Third Week)
2. Four Digit – Example 0798 > 079- Day of Year (would land in March) , 8 – 1978/1988/1998/2008.

What carburetor do I have?

The list number is stamped on your carburetor, either on the corner of the airhorn or choke tower or, if it doesn’t have an airhorn, on the mainbody. Remove the carburetor from your vehicle before looking for the list number to easily find the information you need.

What’s the difference between Holley 4150 and 4160?

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.

What happens if your carburetor is too big?

An engine with a carb that is too big will put out less Torque and Horsepower . It will be difficult to drive due to poor low-end torque. If you drag race your car, an oversized carb will produce slow 60 ft. times.

How do I know what size carburetor to get?

How to Choose a Carburetor

1. Engine Size (c.i.d.) X Maximum rpm/3,456 = cfm at 100-percent Volumetric Efficiency (VE)
2. Example: 350 c.i.d. X 6,000 rpm = 2,100,000/3,456 = 608 cfm. Approximately 608 cfm would be required for this engine.
3. Street Legal Carburetor.
4. High Performance Street/Strip Carburetor.
5. Race-Only Carburetor.

What happens if 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.