Holley Sniper EFI Quadrajet Self-Tuning Fuel Injection System 500hp # HO550-867
SKU: 32354909334

Holley Sniper EFI Quadrajet Self-Tuning Fuel Injection System 500hp # HO550-867

Sale price$1192.50 Regular price$1325.00
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Description

Holley Sniper EFI Quadrajet Self-Tuning Fuel Injection System 500hp # HO550-867Holley Sniper EFI Quadrajet Self Tuning Fuel Injection System 500hp # HO550 867 Fuel Injection Systems, Sniper EFI, Quadrajet, Throttle Body, Polished, Spread Bore Flange, Injectors, Pressure Regulator, Harness, Tuner, Kit Fuel Injection Style: Throttle body Fuel Injection System Type: Single 4 Barrel Throttle Body (Spread Bore Flange) Maximum Horsepower with Gas: 500 Timing Control Compatible: Yes Power Adder Compatible: No ECM Included: Yes Self

Holley Sniper EFI Quadrajet Self-Tuning Fuel Injection System 500hp # HO550-867
Fuel Injection Systems, Sniper EFI, Quadrajet, Throttle Body, Polished, Spread Bore Flange, Injectors, Pressure Regulator, Harness, Tuner, Kit
Fuel Injection Style:
Throttle body
Fuel Injection System Type:
Single 4-Barrel Throttle Body (Spread-Bore Flange)
Maximum Horsepower with Gas:
500
Timing Control Compatible:
Yes
Power Adder Compatible:
No
ECM Included:
Yes
Self Tuning:
Yes
User Tunable:
Yes
Fuel Pump Included:
No
EGR:
No
Transmission Controller Included:
No
Metering Style:
Speed density
Intake Manifold Included:
No
Multi-Port Fuel Rails Included:
No
Throttle Body Included:
Yes
Throttle Body Mounting Flange:
4-barrel spread bore
Venturi Quantity:
4
Venturi Diameter (mm):
34.93/51.00mm
Airflow Rate (cfm):
715 cfm
Throttle Body Material:
Cast aluminum
Throttle Body Finish:
Tumble polished
Injectors Included:
Yes
Injector Size (lbs/hr):
100 lbs./hr.
Calibration Module Included:
Yes
Wiring Harness Included:
Yes
Oxygen Sensor Included:
Yes
Fuel Pressure Regulator Included:
No
Distributor Included:
No
MAP Sensor Included:
Yes
IAT Sensor Included:
Yes
TPS Sensor Included:
Yes
IAC Motor Included:
Yes
Quantity:
Sold as a kit.
Holley Sniper EFI Quadrajet Self-Tuning Fuel Injection Systems
Holley Sniper EFI Quadrajet self-tuning fuel injection systems are ideal replacements when you're tired of rebuilding the 50-plus-year-old Rochester Quadrajet (Q-jet) on your classic ride. They're the first bolt-on, spread-bore, EFI throttle-body systems not requiring any additional adapters, sealing plates, or intake manifold swaps. They retain the same great features as the 4150 Sniper EFI version (four 100 lbs.-hr. injectors; built-in timing control; high resolution 3.5 in. full color touchscreen; etc.). Their throttle body will support naturally aspirated power up to 500 hp. In addition, they offer multiple fuel inlet configurations that allow for a stock-appearing installation and fit most stock air cleaners. Modernize your Q-jet-powered classic vehicle with a Holley Sniper EFI Quadrajet self-tuning fuel injection system. They are offered individually or in Master kits with external fuel pressure regulator preset to 58.5 psi, 20 ft. of 3/8 in. Vapor Guard fuel hose, fuel pump, filters, necessary hardware, and bulkhead fitting to return fuel into the tank.Features, items, and specs: Designed to deliver the signature "Rochester Roar" at wide-open throttle! Throttle body-mounted ECUno extra boxes to mount Only 4 wiring connections required (battery positive and negative, switched ignition, and rpm) Transmission provisions on throttle lever for TH350/TH400 and 200R4/700R4 Universal throttle and transmission kick-down bracket Brake booster adapter (if required) Simple calibration wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its ownno laptop required) Internal fuel pressure regulator preset to 58.5 psi 20 ft. of 3/8 in. Vapor Guard fuel hose Fuel pump and filters Necessary hardware and bulkhead fitting to return fuel to the tank Genuine Bosch LSU 4.9 wide-band oxygen sensor provides real-time fuel map learning OEM-style throttle position sensor (TPS) and idle air control (IAC) for years of dependable service Clamp-on oxygen sensor kit ensures leak-free oxygen sensor installation with stainless steel T-bolt clamps and weld-ready oxygen sensor flange
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: 32354909334

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4.7 ★★★★★
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Anthony Ginnetti
Fort Morgan, US
★★★★★ 5
Great product! Durable, chewable, awesomeness!
Color: Grilled color, Color: Grilled color
Very well made and durable. My dog hasn't left them alone since i opened them. Hes been at it for about 45 minutes straight now! Lol. He's an avid chewer. He will chew thru and fabric or cloth toys in less then a day. But these are what he really likes because they take time to chew apart. The shapes, are great, because one he props up with his paws and chews and it seems like it's easy to grip for him. Thru are hard so if you have hard floors it can get a bit noisy when he drops them. Over all this is a great product. Safe, chewable, long lasting, fun shape looks real to him (i think lol), Me and my dog Lucky are both happy with his new toys!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 27, 2026
J
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Jackster
Belleville, US
★★★★★ 5
Recommend for very heavy chewers
Color: Grilled color
My aggressive chewers love these! It’s been a few weeks and still in one piece and man they chew them for hours on end.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
N
Verified Purchase
Nicholas Kiefer
Boise, US
★★★★★ 5
Amazingly great product!
Color: Grilled color
I’m not just saying this, ok, this is not hyperbole: this is THE best nylon bone for chewing that I have ever purchased. And you get TWO of them for relatively less expensive than most chew toys give you one! I have 2 golden retrievers, and if you know goldens, you know that they are some of the most relentless and powerful chewers around. So I can’t give them almost any toy other than rubber stuff or it will be destroyed in a period of time that doesn’t make it worth it. One of them even figured out how to destroy a supposedly indestructible toy made out of kevlar! She was able to get into it through the seam, which is not kevlar ha ha. Anyway, I digress; I never even considered nylon chews because they suck! Usually. Usually my dogs in the past have lost interest with them in less than a day. I took a chance on these mainly because of the novel shapes, the fact that they give you two, and the low price. Both my goldens LOVE these! Not just for one day, but going on weeks now! I don’t know if it’s the flavor or what, but I will see them gnawing on one of them at some point every day. And they CAN’T destroy them (I knew nylon was good for that, but it was the “who cares” attitude of my previous dogs toward nylon that kept me away). Both the “ribs” and “steak” (quite clever) are a bit worn on the edges now, but they look like they will be around for years. You can’t go wrong with this product (unless for some reason your dog does not like the flavor, but the flavor seems to be what draws my dogs to them). I highly recommend this (these) as the most cost-effective chew toy I’ve ever purchased.
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Reviewed in the United States on November 1, 2025
S
Verified Purchase
Sue Roob
Grantham, US
★★★★★ 4
Great for larger dogs
Color: Grilled color
I think they were heavy duty and durable, but they were too heavy for my dog. The seller was excellent though!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
R
Verified Purchase
Rodney
Omaha, US
★★★★★ 5
Dog chew toys
Color: Grilled color
Smaller than expected but dogs liked it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026

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