SKU: 484976563

770 CFM Ultra Street Avenger Carburetor - 0-86770BK

Sale price$414.88 Regular price$460.98
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Ships within 48 hours · Estimated delivery Aug 4 - Aug 9

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Description

770 CFM Ultra Street Avenger Carburetor - 0-86770BKOverview: ULTRA light Aluminum construction for 43% weight savings ULTRA strong Billet metering blocks & base plates ULTRA cool Black anodized billet aluminum metering blocks and base plate ULTRA easy Built in sight window for simple float adjustments ULTRA fast High performance fuel curves The Ultra Street Avenger carburetors feature all aluminum construction and are equipped with metering blocks and a base plate made from 6061 T6 billet aluminum.

Overview:

ULTRA light - Aluminum construction for 43% weight savings ULTRA strong -Billet metering blocks & base plates ULTRA cool - Black anodized billet aluminum metering blocks and base plate ULTRA easy - Built in sight window for simple float adjustments ULTRA fast - High-performance fuel curves The Ultra Street Avenger carburetors feature all aluminum construction and are equipped with metering blocks and a base plate made from 6061-T6 billet aluminum. They weigh in at approximately 5 lbs less than a comparable zinc carburetor. The new Ultra Street Avenger carburetors have the same great features as their aluminum counterparts such as a tumble polished aluminum finish; quick change vacuum secondaries for easy tuning to optimize performance or fuel economy; four vacuum ports for all necessary vacuum accessories; factory preset electric choke for easy startups; built-in fuel filters; and an included fuel line kit so there are no unnecessary trips back to the parts store. Ultra Street Avengers feature the same optimized street calibration as the zinc versions so you know they will run great on your vehicle. In addition, the Ultra Street Avenger now comes with anodized metering blocks and a base plate made from 6061-T6 billet aluminum and a built in, clear fuel level sight glass for easy, no mess fuel level adjustments. Don't trust your performance to just anyone, Holley is the only Modular carburetor company that has been in business for over 100 years and has powered every NASCAR champion since the 60's.

Features:

  • Shiny with black anodized billet aluminum metering blocks/base plate for good looks and true gasket sealing
  • Ultra Street Avengers feature an optimized street calibration that works-out-of-the-box
  • Factory preset electric choke for easy startups
  • Vacuum secondaries allow use on a wide variety of vehicles. Quick Change vacuum housing cap allows you to tune for performance or fuel economy (springs included)
  • 4 corner idle allows you to precisely control your idle system
  • Built in, clear fuel level sight glass for easy, no mess fuel level adjustments
  • Aluminum construction for a 43% weight savings
  • Compatible with GM, Chrysler, and Ford A/T kickdown linkage. Additional parts may be required.
  • Fuel line kit included so there are no unnecessary trips back to the parts store
  • Limited lifetime warranty - Guaranteed to be free from defects in material and workmanship for the life of the product!
  • 100% wet-flow tested by Holley technicians to assure it arrives ready to run!

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Barrels 4
Billet Color Black
Booster Down Leg
Brand Holley
Carburetor Use Street
CFM 770
Choke Electric
Condition New
Emission Code 3
Finish Shiny
Fuel Gasoline
Fuel Inlet Dual
Marine Use No
Material Aluminum
Model 4150
Primary Main Jet 72
Primary Power Valve 6.5
Primary Pump Nozzle Size 31
Product Type 4150 Model Carburetor
Secondaries Vacuum
Secondary Main Jet 84
Supercharged Application No
Throttle Bore 1.6875 inch
Vacuum Ports 1 timed (spark) port, 2 full, and 1 PCV port
Warning California Proposition 65
Warranty Limited 1 Year Warranty
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 484976563

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4.0 ★★★★★
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madeleine
Fort Morgan, US
★★★★★ 5
good quality
Size: X-Small, Color: Black (001)/White
keeps me warm during the cold months when i play golf. tight enough to move around in but not tight at all around the neck. overall a really great product. has kept up for the last 4 years very well
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Reviewed in the United States on May 19, 2026
C
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Ching
Lexington, US
★★★★★ 5
Fit and Length
Size: X-Large, Color: (401) Royal / / White
Yeah this fits perfectly. Very soft, the color pops, keeps you warm. I use these under my sweatshirts, cable sweaters, and my flannel shirts. For me it's about the arm length and how well the item contours to the body to help with warmth. Thank you for getting this right.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2026
B
Verified Purchase
BB
Pawtucket, US
★★★★★ 5
Worth it.
Size: Small, Color: Black (001)/White
Living in North Dakota, staying warm is invaluable. UnderArmour Cold Gear is the only base layer the provides warmth, KEEPS warmth, and protects from the unforgiving wind. Every winter I go on the hunt for thermals, layering options and I always find others to be saggy or incredibly tight, either way, once I begin shoveling or snowblowering, and sweating, other products become soaked, sticking to skin, unbreathable and quickly your sweat stuck to your body under layers in now creating a cold,chill, freeze to your body, and on a -10F day, it can become a dangerous situation. I honestly was hesitant to purchase UnderArmour, I felt it was too hyped up or paying for a name. BUT IT IS NOT. UnderArmour isn't a name, it is a company that has made the highest quality base layer, warmth, breathable and it really wicks sweat away; I may not know how it does it, but it works! For sizing, I ordered a small in the women's longsleeve/turtleneck black coldgear. I'm 5ft and roughly 110lbs. I like the fit, it is meant to fit your body. I probably could wear an extra small, but I like the sleeve length in the small and it fits very well. Stay warm folks!
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Reviewed in the United States on December 6, 2023
A
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Amanda
Cuba, US
★★★★★ 5
Great cold gear
Size: Large, Color: White (100)/Black
Warm, very comfortable. I wear these all winter. The neck can be a little tight and the cut is definitely fitting. Its got thin like fleece on the inside that keeps you warm.
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Reviewed in the United States on November 3, 2025
K
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Katia
Natrona Heights, US
★★★★★ 4
Tight but stays in place, comfy and keeps you warm
Size: Medium, Color: Charcoal Light Heather (019)/Black
I liked this shirt because it keeps me warm when I'm outside even at negative temperatures, I can work out comfortably in it and the sweat dries out soon; also, the interior of the shirt is made of a very comfortable material. I don't like that this is very tight, cool if you want to use it under your usual sports clothes but if you want to use it as is I would suggest going up a size. I use this shirt almost every day to work out during winter time, I've washed them several times and they still feel as comfortable as the first day.
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Reviewed in the United States on January 5, 2022

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