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  • Holley Float Bowl Upgrade & Electric Choke Install - Carb Refurbish

Holley Float Bowl Upgrade & Electric Choke Install - Carb Refurbish

Upgrading A Holley For Everyday Use

Calin Head
May 1, 2009
Photographers: Calin Head
Photo 2/29   |   holley Carburetor Refurbish float Bowls
Holley came out with the first modular carburetor, the 4150, back in '57. By '65, the 100,000,000th carburetor came off the Holley assembly line. Today, Holley still makes the 4150, heck, it even makes hopped-up versions for everything from drag racing to rockcrawling. With times getting tough, a brand-new shiny carb may be out of reach for some enthusiasts, but a decent swap meet find may not. There always seems to be a guy at the swap meet with stacks of them ready to be fixed up.
One major trend that most Holleys have fell victim to is the removal of the choke system. Some even had the choke tower machined off completely. Most were ditched as guys tried to squeak out every ounce of power they could for lower quarter-mile times. While some gains can be found hacking away chunks of the main body, it isn't worth losing the choke unless the truck is a drag-race-only vehicle. This story is going to show that a carb can be brought back to fully functioning condition with minimal work.
Holley has an extensive list of replacement parts for those cannibalized carbs as well as upgrades to make the carb a little easier to tune. Also added to the mix are these cool quick-disconnect fuel inlet fittings made by Jiffy-Tite. The Quick Connect Fluid Fittings are available for use with fuel, as well as oil and water systems. Fittings are available in a variety of thread styles, and once installed, you can unhook the fuel lines by pulling back on a collar, much like the fittings on your air compressor hose. The fittings will keep the fuel from running out all over the place when separated thanks to small check valves inside. You can easily swap your street carb for a track carb with these fittings. Holley, Demon, and Carter carbs are covered right now with more to come.
What's In The Box?
After calling the Holley tech line and giving the tech the serial number of my carb (stamped on the choke tower), the guy on the phone gave me all the part numbers I needed to install an electric choke and upgraded float bowls with glass sights. I also picked up the new Jiffy-Tite quick disconnect fittings so swapping carbs later will be a snap.
Part One: The Float Bowls
Here are all the parts that came with the float bowl upgrade. The box not only contained new center-hung float bowls, but all the gaskets needed for the swap. I will reuse my floats and needle and seat assemblies because they were in great shape.
Part Two: The Choke
To get my choke working again, I needed the shaft, plate, and the electric choke conversion kit. I could have put a manual choke on the truck, but since I was upgrading stuff why not go electric?
Photo 25/29   |   holley Carburetor Refurbish fuel Inlet Fittings
Quick-Disconnect Fuel Inlet Fittings
Check out these new quick-disconnect fuel inlet fittings from Jiffy-Tite. These will replace the stock fittings and allow for fast and clean removal of the carb. Because each end will seal itself when removed, dumping fuel all over the manifold will be eliminated.
Photo 29/29   |   holley Carburetor Refurbish upgraded Choke
The Final Word
With the carb back to fully operational status, the truck fires up nice and easy and doesn't stumble while mildly accelerating. It does make it very nice when I am running late and don't have much time to let the truck warm up all the way. To fix the choke and upgrade the fuel bowls cost just over 150 bucks, which is much less than a new carb and not enough to break me.


Lancaster, NY 40860


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