FAQ: How Do You Identify A Holley Carburetor?

What do the numbers on a Holley carb mean?

The first three numbers indicate the day of the year; the last digit, the year of manufacture. Here, “2889” indicates a carb made on the 288th day (which falls in the month of October), of a year ending in 9 (1969, 1979, 1989, 1999, etc.).

How do you date a Holley carb?

Moving on, 0798 is our date code; Holley used a three digit up to 1973, after which they moved to the four digit code you see here. Decoding them is as follows: Three Digit – Example 763 > 7 – Year (1967), 6 – Month (June), 3 – (Third Week)

How do I know what carburetor 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.

How do I know what CFM my carburetor is?

The volumetric efficiency of the engines is a measurable value, and with an adequate carburetor will get the most efficiency out of the engine. The formula to calculate the amount of CFM (cube feet per minute) that a motor needs is CFM= Cubic Inches x RPM x Volumetric Performance รท 3456.

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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 size carburetor 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 CFM is a Holley 4160?

Holley 0-80457S Model 4160 600 CFM Square Flange 4-Barrel Vacuum Secondary Electric Choke Carburetor.

How do I know what size Holley carb 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.

Did Holley buy demon?

We reported that BG Fuel Systems and Demon Carburetors were poised for a comeback in a blog earlier this week. The fact that the company was bought by High Performance Industries, the same company that owns Holley, Demon’s biggest competitor, has created a bit of a stir in the automotive aftermarket.

What happens if your carburetor is too big?

If the barrels are too big, the loss of air velocity means the cylinder will not fill to its full capacity. 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.

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What size carburetor do I need for a 360?

If the engine is mostly stock the 600 – 625 cfm should be fine. If the engine is hot rodded, and you race it, then a 750 cfm would give you slightly more power.

How much horsepower will a 750 cfm carb support?

A 750DP on a 330hp-400hp 5.7 with a dual plane intake (performer rpm) is easy to tune and will make max power to boot.

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