# What cfm carb do I need for a 289?

## What cfm carb do I need for a 289?

Registered. As the general consensus reads out, the 650cfm carb is a bit too large for a normal 289….. A 600 cfm carb is on the top side, size-wise for even a hopped up 289… You’d really have to rev the 289 to make good power with the 650 cfm.

## Is a 750 cfm carb too big for a 302?

Its either the jets are too big or if its a Holley it could have a blown power valve or it may be leaking gas from the floats being set too high. In general, if you take a 750 cfm carb out of the box and bolt it on a 302 it may need to be rejetted down some but not always.

How do I know what size carburetor to get?

To arrive at the most appropriate carburetor choice, there’s a basic formula: engine displacement multiplied by maximum rpm divided by 3,456. For example: a typical 355ci small-block—a 0.030-over rebuild—with a 6,000-rpm max engine speed would work well with a 616-cfm carb ((355 x 6,000) 3,456 = 616.32).

What size is a 289?

The 289 cu in (4.7 L) was also introduced in April 1963. Bore was expanded to 4.00 in (101.6 mm), becoming the standard bore for most small block engines. Stroke remained at 2.87 inches. The 289 weighed 506 lb (230 kg).

### What is the best carburetor for a Ford 302?

Registered. For a stock 302, or slightly warmed over one, I’d go with an Autolite 4100 series.

### Does a carburetor add horsepower?

After you fix what’s limiting performance, an Edelbrock Performer intake can add as much as 10 HP.

How do I calculate carburetor cfm?

How to calculate Carburetor CFM. The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. Any ordinary stock engine will have a volumetric efficiency of about 80%.

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.

#### What kind of CARB do I need for my Ford 289?

I am currently running a 30+ yr old holley 1850, 600cfm 4bbl on my 289. The motor is bored 30 over and I am installing AFR 165 heads, long tube headers, and a comp cam. Will I benefit from a new carb? The carb on the car now (described above) was rebuilt about 2 yrs ago. I am looking at a holley street avenger 670.

#### Which is the best carb for a Ford Mustang?

What is the best carburetor choice for a stock 289? Either go with the autolite 2barrel like they came with or upgrade to a 4b alum dual plane intake and a 470-500 cfm carb. Good Luck.

What kind of vacuum does a 302 Mustang produce?

My 302 with a 272 degree, .484″ lift cam is producing 14-15″ of vacuum at idle with initial timing of 12-14 degrees and 34 degree or so all in. I just installed a Holley 600 cfm Street Warrior. I bought a “Factory Rebuilt” one directly from Holley.

Do you have to re-manufacture a carburetor?

Have your fuel system flushed or replaced before installing the carburetor if your vehicle has been stored for some time. This is a professionally re-manufactured carburetor. It has been completely rebuilt and live running engine tested to restore the OEM specs & performance, you most likely do not need to re-adjust.