Holley Carburetors. Mike Mavrigian

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       The Ultra Series 4150 carbs are offered in either mechanical- or electric-choke versions. The Ultra HP series eliminates the choke provision.

      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 3,000-rpm range.

       Avenger

      Introduced In 2009, 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 4150 carbs. This line of carbs is also offered in both diecast and aluminum body construction. The Ultra Avenger series offers some appearance enhancements such as metering blocks and bodies in Hard Core Black, Hard Core Gray, blue, and red. The lineup is quite extensive.

      In 2011, Holley released a new aluminum Ultra HP 4150-series carb with 30 new and improved features, including larger 1.6-inch venturis. The Avenger series is offered in ratings from 470 to 870 cfm, in both street and truck/off-road configurations. 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. If used with a GM overdrive TH700R4 or TH200R4 transmission, you need Holley’s transmission kickdown cable bracket (PN 20-95) and geometry corrector (PN 20-121). Depending on your throttle bracket, you also need a throttle stud (PN 20-2, 20-38, or 20-40). The Street Avenger includes a Ford automatic transmission kick-down, 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 4150 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. Holley’s Hard Core Black finish has become very popular. This is a 750-cfm Ultra Double Pumper (PN 76750HB).

       In the Ultra series, the two letters at the end of the part number indicate color (HB is Hard Core Black, RD is red, BL is blue, etc.).

       Holley Ultra 4150 street/strip Double Pumper carbs share the same features, including aluminum construction for reduced weight, billet aluminum metering blocks and baseplate, mechanical secondary operation, choice of manual or electric choke, four-corner idle adjustment, clear sight windows on both bowls, are optimized for out-of-the-box street/strip calibration, and are available in 650 to 750 cfm.

       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 80801RD).

       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 essentially a 4150 race carb, using features taken from race HP and Double Pumper carbs, and then “tamed and tuned” for street and light-competition applications. The Street HP series is offered in yellow chromate, black, or tumble-polished finish. Sizes range from 600 to 950 cfm. The metering system includes a timed-spark port for a vacuum-advance distributor and it is calibrated for superior throttle response for street/strip use. The Street HP baseplate offers several vacuum ports for power brakes, positive crankcase ventilation (PCV), etc.

       Although various finishes/colors are offered in Holley’s current lineup, Hard Core Black (often referred to as Hard Core Gray) has become increasingly popular for those who wish to deviate from bright colors. This Ultra HP carb is mounted to an intake manifold that has been smoothed and hydro-dipped for a carbon-fiber appearance.

       Street Avenger carbs are specially designed and calibrated for optimum street performance; they are available in sizes ranging from 570 to 870 cfm. All have vacuum secondary operation and are available with either manual or electric chokes. The aluminum construction reduces weight.

       Note the dual fuel-feed fittings on the primary and secondary bowls. However, the Avenger is not a double-pumper carb, so don’t assume that a carb is a Double Pumper just because it has center-hung fuel bowls and dual feed.

       Note the absence of a secondary accelerator pump on the rear bowl on this Street Avenger. Remember, just because a carb has a dual feed fuel fitting for each bowl, it’s not a Double Pumper unless it has an accelerator pump on each bowl.

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