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Holley Stealth EFI Systems
Pontiac V8 Holley Stealth EFI Systems
Looks Like a Carburetor — Holley Stealth EFI Systems for Pontiac V8s
Holley Sniper Stealth systems are built for the owner who wants fuel injection and does not want it to show. The wiring exits below the rear fuel injector cover, the air entry is machined for stock-style air cleaners with locator provisions, and the timed spark port for a vacuum advance distributor sits under the front fuel bowl where you can still reach it.
Butler stocks the Sniper Stealth 4150 in shiny, black and classic gold finishes, and the eight-injector Super Sniper Stealth 1250 in black. All of them self-tune through a 3.5 in. touchscreen with no laptop required.
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1. Sniper Stealth 4150
A bolt-on 4150 flange carburetor replacement with four 100 lb/hr injectors, supporting up to 650 HP naturally aspirated or 600 HP on forced induction. The ECU mounts on the throttle body, so there is no separate box to find a home for.
| What makes it stealth | All of the wiring exits below the rear fuel injector cover, and a high pressure fuel crossover line is included so the plumbing stays tight to the body. |
| Distributor access | The timed spark port for vacuum advance distributors is located under the front fuel bowl. On a Pontiac with the distributor at the front of the engine that is the difference between an easy hookup and a fight. |
| Finishes | Shiny, black and classic gold, so the look can match a restored engine bay or a blacked-out build. |
| Transmission | Kickdown provisions for GM TH350/400 and 200R4/700R4 and Ford C4/C6 are built in. |
2. Super Sniper Stealth 1250
Same single pattern 4150 bolt-on design, same carburetor styling, eight 100 lb/hr injectors. It supports up to 1250 HP boosted, which is the reason to buy it.
| When it is the right call | A blower or turbo in the plan, now or later. For a naturally aspirated Pontiac the four-injector Stealth covers the same ground. |
| Same simplicity | Four wiring connections, the same calibration wizard, the same 3.5 in. full color touchscreen for tuning and gauge display, and the same self-tuning ECU behavior. |
| Ecosystem | Pairs with Sniper HyperSpark ignition, fuel systems, air cleaners and digital dashes rather than being a standalone part. |
3. Fuel pressure and the master kit question
| External regulator required | Sniper Stealth systems require an external fuel pressure regulator set to a base pressure of 58.5 PSI. Plan that into the fuel system, not around it. |
| Master kit content | Holley's master kit version includes a complete fuel system with the regulator preset to 58.5 psi, 20 ft of 3/8 in. Vapor Guard fuel hose, a fuel pump, filters, the necessary hardware and a bulkhead fitting to return fuel to the tank. |
| Oxygen sensor | A genuine Bosch LSU 4.9 wide-band comes with the system and drives real-time fuel map learn. The included clamp-on oxygen sensor kit for 2.25 in. exhaust gives you a leak-free bung with stainless T-bolt clamps. |
If the car is going to keep a stock air cleaner and an original-looking engine bay, this is the Holley family to shop. Choose by finish and injector count, then sort the tank and pump.
Not sure what your Pontiac needs?
Call our tech team at 866-762-7527. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.