Question: How To Decode A Holley Carburetor?

How do I identify my Holley carburetor?

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 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.

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 are the symptoms of a blown power valve in a Holley carburetor?

Problems: The incorrect size power valve, or a blown out power valve can cause problems such as poor fuel economy, black smoke emanating from your exhaust, dark or fouling spark plugs and a poor idle. If you suspect that your carburetor has a blown-out power valve, you can perform this simple test.

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 CFM is a Holley 4160?

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

How do you troubleshoot a Holley carburetor?

(1) Remove air horn and check float settings. (2) Check float needle and seat for proper seal. If the needle is defective, replace with a Holley matched set. (3) Check float for being loaded with fuel, bent float hanger or binding of the float arm.

What is a Holley 3310?

Once described as the small block Chevy of fuel delivery, the Holley 3310 carburetor (4150 and 4160 models) is still the go-to carburetor for anyone building a performance engine. The legendary Holley 3310 was born. The 3310 feeds the Z16 Chevelle’s 396 big block with 780 cfm of air.

What cfm 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.

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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.

How much horsepower will a 650 cfm carb support?

So, using your Google-Fu you type “How much power can a 650 cfm carb support?” Well, chances are that you’ll get answers in the 450-470 hp range, but that’s not really the right way to look at it.

How do you diagnose a bad power valve?

A blown Power Valve acts like it is open all the time resulting in a Dramatically over rich mixture at Idle and no response when adjusting the Air Screws. If your Vacuum at Idle is say 10Hg’s you should run something like 6.5 Hg Power Valve so that it only opens when you blip the throttle when the Vacuum drops.

Do carburetors go bad?

Since the carburetor can become damaged or clogged over time, you should be aware of the symptoms that indicate the carburetor needs to be replaced. Signs that indicate your carburetor needs to be replaced include: Poor fuel economy. The vehicle idles too fast.

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