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The graph below can be used to find your airflow requirement. It’s based on 100% volumetric efficiency so any indi-cated airflow must be multiplied by the volumetric efficiency of your particular engine. Use a carburetor with an air-flow rating equal to or slightly smaller than the air requirement of your engine.
Let’s begin by looking at carburetor size since that seems to be the biggest question on everybody’s mind – “What size Holley do I need for my engine?” For carburetors, sizing is rated by a rated volume of air it can flow.
You can consult one of Holley’s carb selection charts. Based on 100-percent VE, if the chart indicates that the best size is, for example, 700 cfm, if the engine has around 85-percent VE. So, in theory, a better choice for that engine might be a carb size of 600 cfm.
In some cases, you can do a Holley carburetor identification by looking at the carb itself and reading the model number stamp. Many Holley carbs have the model number stamped on the choke horn if the carburetor has a choke.
Knowing how to choose the correct Holley carburetor for your application is absolutely vital before you hand over your hard-earned money. No amount of tuning and tinkering will make an improperly sized carburetor run as good as the correct carb.
The Ultimate Guide to Holley Carburetors. Everybody has a least carburetor, but not everybody knows how to tune them, so we're giving you a bunch of charts, graphs, advice and tips so...
Begin your calculations with traditional carburetor-sizing formulas, then, figure in what makes your engine recipe unique.
Such a list would be too big on our website, so we are going to list the most popular Holley four barrel carb List #'s and their cfm size and stock jetting specifications. When you buy a used carburetor always check the jetting.
Carb Number Carb Model Number CFM Renew Kit. Trick Kit: Needle & Seat Primary Main Jet Secondary Main Jet or plate Primary Metering Block Secondary Metering Block Power Valve Pump Nozzle Size, Primary Secondary Nozzle Size or Spring Color Primary Bowl Gasket Primary Metering Block Gasket Secondary Bowl Gasket Secondary Metering Block Gasket ...
Holley’s interactive carburetor selector will give you the answer after asking a series of simple questions. As each question is answered the carburetor selector program narrows down the list of available carburetors for your application.