How to tell Carb model?

[Saxman]

I thought I had a Holly 650, but I can't spot a model number anywhere. How do I find out exactly what I have?

Thanks for the help!

[billlsbird]

.....I identified my Holley 750 double pumper by the numbers on it. The motor is back in Kansas now so I can't go look to see exactly where the numbers were located but they were on the outside where I could see them. It had the model number on it {in my case xxx4779}. I then went to the Summit web site, put in '4779' in the search & my carb came up .... I thought I had an 850 but no it's a 750...... hope this helps ya, Bill
ps, if you still have problems I'd call Holley.....

[skids72]

What if you have no air horn? I'm not sure if mine didn't have one to begin with or if the choke tower was milled down by a previous owner.

I think I found a list number in a corner of the top surface of the main body... I'd have to check it again.

[skids72]

I hear ya... I found the number on Holley's list many moons ago and it agreed with what I thought I had (4150 750 dbl pump mech secondaries). I'll try to post a photo tonight for educational purposes....

Chris

[southerner]

With the square flange family of Holleys, there are 2 models 4150 and 4160.
The 4150 hase a metering block on the secondary side as well as the primary side. Therefore this carburettor is longer.

A 4160 has a metering plate on the secondary side that is covered by the fuel bowl.

Here is an example for a holley list 3310 you may notice that there is a space after this list number and it has a 1 or 2 after it. This suffix number denotes wether it is a 4150 or 4160 model.

So 3310 - x = 750 cfm vacume sec

- 1 = 4150

- 2 = 4160.

Now.... this applies to new carburetors and well looked after original old ones, as you can buy metering block kits to convert your 4160 series carb to a 4150 series.

Vacume secondarys and double pumpers.

This is easy the vacume secondary has a vacume chamber out the side. And no secondary accelerator pump.

The double pumper has a secondary accelerator pump circuit and they are allways a 4150 model carburetor. The secondarys are manually operated by a progresive linkage from the primary throttle shaft.