Built for classic installs where hood clearance is tight or the factory spreadbore intake needs to stay in place, the Sniper EFI Quadrajet bolts on without adapters, sealing plates, or intake manifold swaps. It retains the same core Sniper EFI feature set as the 4150 version — four 100 lb/hr injectors, built-in timing control, and a 3.5 in. LCD touchscreen — while fitting most stock Quadrajet air cleaners for a factory-style appearance. Not for marine use; installers in a marine setup should use Holley P/N 550-869 instead.
Key Features:
- (4) 100 lb/hr fuel injectors and a 715 CFM throttle body supporting up to 500 hp naturally aspirated
- Delivers the signature Rochester Roar at wide-open throttle
- Genuine Bosch LSU 4.9 wideband oxygen sensor for maximum performance on real-time fuel map learning
- Built-in Manifold Air Pressure (MAP) and Inlet Air Temperature (IAT) sensors automatically adjust to changing conditions
- Integrated ignition timing control when paired with the HyperSpark line of distributors and ignition components, or Holley Dual Sync
- Included universal throttle, transmission kickdown bracket, and brake booster adapter
- Transmission provisions on the throttle lever for GM TH350/TH400 and 200R4/700R4
- Included Holley P/N 526-12 fuel system with fuel pump, pressure regulator, filters, supply and return hose, hose fittings, clamps, and bulkhead fitting
- Fuel pump outlet wire with built-in relay to directly power the fuel pump
- 3 ground trigger outputs to control accessories such as cooling fans or A/C
- 3.5 in. LCD handheld touchscreen for setup, tuning, gauge displays, and other viewing parameters
- Only 4 wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
- Initial handheld calibration wizard creates a base tune with no laptop needed
- Throttle body mounted ECU for a cleaner engine bay
- Fits most stock Rochester Quadrajet air cleaners
Specifications:
- Product Type: Sniper EFI Quadrajet Master Kit
- Finish: Classic Gold
- CFM: 715
- Coast Guard Approved: Yes
- Flange Style: Spreadbore
- Throttle Bore: 1.375 in. Primary / 2.00 in. Secondary
- Max Horsepower Rating: 500 Naturally Aspirated
- Injector Size: 100 lb/hr @ 58.5 PSI
- Fuel Pressure: 58.5 PSI
- Fuel Pump Flow Rating: 240 LPH
- Fuel System: Inline, Master Kit
- Height: 3.28 in.
- Transmission Compatibility: 700R4/200R4
- Sub Category: Service Kits
- Warning: California Proposition 65
- Part Number: 550-869K
Installing in a marine setup? Use Holley P/N 550-869 instead.
FAQ
How much horsepower can the 550-869K support?
Up to 500 hp naturally aspirated, using four 100 lb/hr injectors and a 715 CFM throttle body.
Does this kit include a fuel system?
Yes, this master kit includes Holley's P/N 526-12 return-style fuel system with pump, pressure regulator, filters, hose, and bulkhead fitting.
Is this kit suitable for a marine installation?
No. For marine setups, use Holley P/N 550-869 instead.
Do I need to modify my intake manifold to install this kit?
No. It bolts on to the factory spreadbore intake manifold without adapters, sealing plates, or manifold swaps.
What transmissions is this kit compatible with?
The throttle lever includes kickdown provisions for GM TH350/TH400 and 200R4/700R4.
