How to Identify Holley Carburetors
Double Pumper carbs are best suited to lighter-weight vehicles, those equipped with a manual transmission, and those with high— stall-speed automatic transmissions in the 3,rpm range. Introduced In , the HP-series Street Avenger includes cast aluminum bodies with billet metering blocks and baseplates that reduce overall weight by an astounding 5 pounds compared to previous carbs.
This line of carbs is also offered in both diecast and aluminum body construction. The lineup is quite extensive. In , Holley released a new aluminum Ultra HP series carb with 30 new and improved features, including larger 1. Although the majority of Avenger carbs have electric choke, six versions within the entire lineup are offered with manual choke.
All Avengers have vacuum secondaries. Street Avenger carbs were designed and calibrated specifically for optimal street performance, with features including a secondary metering block, four vacuum ports for positive crankcase ventilation, power brake, spark, and vacuum accessories. The Avenger series is not designed for immediate bolt-on use with Chrysler automatic overdrive transmissions.
Depending on your throttle bracket, you also need a throttle stud PN , , or The Street Avenger includes a Ford automatic transmission kickdown, but not for use with overdrive transmissions. The Ultra Street Avenger series has aluminum construction and anodized billet aluminum metering blocks and baseplate available in various colors. The Ultra is lighter for those concerned with minimizing weight and comes in several anodized colors.
Personally, I love the Ultra series; in addition to the benefit of reduced weight, they look way cool. In addition to reduced weight and the obvious visual appeal, the anodizing protects the aluminum from long-term corrosion.
The Ultra Series carbs has convenient glass fuel bowl sights, making it much easier to check fuel bowl level during adjustments without the need to remove a solid brass plug. In recent years, black has become the go-to color for those who wish to break out of the chrome-and-color mold and create a pro, understated, somewhat monochromatic appearance. All Ultra and Ultra HP carbs have double-pumper operation with an accelerator pump for each fuel bowl.
The Ultra HP series Double Pumper carbs have no choke and are designed for racing applications for which a choke is not required. This is a tumble-polished aluminum body and billet aluminum metering blocks and baseplate anodized in red PN RD. The Street HP carbs have a smooth, contoured venturi area for superior airflow. The boosters, the dichromate finished components directly over each venturi, are the down-leg style with a single fuel hole inside each barrel opening. The Street HP series is offered in yellow chromate, black, or tumble-polished finish.
Sizes range from to cfm. This Ultra HP carb is mounted to an intake manifold that has been smoothed and hydro-dipped for a carbon-fiber appearance. Note the absence of a secondary accelerator pump on the rear bowl on this Street Avenger. Street Avenger carbs are specially designed and calibrated for optimum street performance; they are available in sizes ranging from to cfm. All have vacuum secondary operation and are available with either manual or electric chokes.
The aluminum construction reduces weight. Avenger carbs have an accelerator pump only at the primary bowl location. Note the dual fuel-feed fittings on the primary and secondary bowls. Avengers are series carbs, so the secondary side has metering blocks with serviceable jets. A quick-change vacuum housing cover allows changing the vacuum spring without the need to disassemble the entire housing unit.
The cover is secured with two screws. Simply remove the two screws and then remove the cover and spring. Some carbs, such as the Avenger, have this as standard equipment. The quick-change feature can be retrofitted to other carbs with a secondary vacuum kit. The housing cover and spring simply pull out. An O-ring seats onto the top of the housing. If it pops loose, be sure to reinstall it into its groove.
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The vacuum diaphragm spring sticks onto the housing top and is easily changed to a lighter or heavier spring to tune the secondary opening rate. This prevents excess fuel spillover from sloshing out of the vent tubes. This is a cfm Truck Avenger PN Photo Courtesy Holley Performance Products.
Holley carburetor Identification help. - Hot Rod Forum : Hotrodders Bulletin Board
The Avenger Truck series is a unique design, intended specifically for truck and off-road applications. It has a single fuel inlet, square fuel bowls with side-hung floats, and an exclusive metering block and vent tube designed to prevent fuel spillover at extreme angles.
Flood-free operation accommodates climbing angles up to 40 degrees as well as side-hill maneuvers and nose-down descents up to 30 degrees. The Dominator was designed as a large-airflow racing carburetor and debuted in although some sources say , initially to address the needs of NASCAR competition. Shortly thereafter, it was offered to the public.
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If you already have an Adobe ID, enter it now. Once Bluefire Reader is installed and activated with Adobe you may download eBooks directly on your device using the download links provided on the confirmation page of your order, the confirmation email or in your CarTech account. Author Mike Mavrigian guides you through each important stage of the Holley carb rebuilding process, so you have the best operating carburetor for a particular engine and application. In addition, he explains carb identification as well as idle, mid-range and high-speed circuit operation, specialty tools, and available parts.
Delve into all aspects of Holley carburetors with knowledgeable instruction from this guide, which shows you how to disassemble, select new parts, rebuild, and calibrate all of the major models. Veteran engine-building expert and automotive author Mike Mavrigian guides you through each important stage of the rebuilding process so you have the best operating carburetor for a particular engine and application. In addition, he explains carb identification as well as idle, mid-range, and high-speed circuit operation, specialty tools, and available parts.
He also includes the techniques for getting all of the details right so you have a smooth-running engine. During the muscle car wars of the s, Holley carburetors emerged as the carbs to have because of their easy-to-tune design, abundance of parts, and wide range of sizes. The legendary Double Pumper, the universal cfm models, the Dominator, and now the Avenger have stood the test of time and are the leading carburetors in the high-performance engine market. To many enthusiasts, the operation, components, and rebuilding procedures remain a mystery.
Yet, many carburetors need to be rebuilt and properly set up for a particular engine package. Holley carburetor owners need a rebuilding guide for delivering exceptional acceleration, quick response, and superior fuel economy. Trying to ID my holley double pumper. Numbers on the horn: underneath Thanks Rich. Rich , Dec 30, Homespun91 , Dec 30, Ratmotor , Dec 30, Does the -4 number behind the make it a ? Just wondering.
Last edited: Dec 30, Thanks for the info. Rich , Dec 31, Guys Thanks for the info on Carb ID. Have a Great New Year. I was hoping someone could identify my carb. It says on the horn and below. Giesick , Feb 17, Homespun91 , Feb 17, Shouldn't be a problem to use it, as long as it's tuned correctly. As a side note, I'd look at optimizing the distributor as well The main jets are listed as the , which isn't serviced by Holley so far as I can tell; you could start with a 65 or 66 and be fairly close to that- although you may end up with somewhere around a 60, at a guess. The secondary metering plate is the , which has.
The original power valve is the , which is a dual-stage Hg piece. The accelerator pump nozzle is a. The secondary spring is the "black" spring. Hope that helps a bit. This helps a lot. Thanks so much! It is a carb.