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Multi-Port EFI Systems
Pontiac V8 Multi-Port EFI Systems
Injectors at the Port — Multi-Port EFI Systems for Pontiac V8s
Multi-Port EFI puts an injector at each intake port instead of spraying fuel down a throttle body, so the intake manifold is part of the system rather than a carryover part. On a Pontiac that means a purpose-built EFI intake, fuel rails and eight injectors sized to the power you are after.
Butler stocks Edelbrock Pro-Flo 4 complete kits for Pontiac 326-455 in two horsepower grades, and builds its own Holley Terminator X multi-port kit around an Edelbrock Torker II EFI intake with port matching available to your cylinder heads.
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More About Multi-Port EFI Systems
1. Why port injection instead of a throttle body
A throttle body system is easier to install because it keeps your manifold. Multi-port costs you the manifold and buys you distribution.
| Fuel placement | Each cylinder gets its own injector at its own port, so distribution stops depending on runner shape and wet flow. |
| Hood clearance is a real factor | These are complete intake systems with a throttle body on top. Pro-Flo 4 kits use a 4150-style manifold with a height of 6.60 in. and a throttle body height of 2.25 in. Measure before you order if the car has a stock hood. |
| Not a bolt-on | Budget for the intake swap, harness routing and a fuel system capable of 58 psi with a return. |
2. Edelbrock Pro-Flo 4: which horsepower grade
Two Pontiac 326-455 kits, same architecture, different injectors. Both are self-learning and tune through the free E-Tuner 4 Bluetooth app on an Android phone or tablet, with no laptop required.
| Up to 550 HP kit | Satin 4150-style single plane intake with 29 lb/hr injectors rated to 550 HP at 58 psi fuel pressure. The right kit for a healthy street 400 or 455 that is not chasing a number. |
| Up to 625 HP kit | The same package with 35 lb/hr injectors. Edelbrock also lists it as boost capable with a 2 bar MAP sensor and injectors upgraded to the target power level. |
| What comes with both | A plug-and-play single connection distributor made for Pro-Flo 4, a fully terminated USA-made harness with labeled connections, and an ECU with a waterproof design and Bluetooth. Neither kit is recommended with E85. |
3. The Butler Terminator X multi-port kit
This is the shop's own package for builders who want Holley EFI architecture on a port-injected Pontiac.
| What is in it | A Holley Terminator X multi-port system, a Holley EFI 1000 CFM four-barrel throttle body, an Edelbrock EFI Torker II intake, Edelbrock EFI fuel rails with 42 lb injectors, and the complete wiring harness. |
| Port matching | Butler can port match the Torker II intake to your cylinder heads, which is the kind of detail that separates a kit that bolts on from a combination that works. |
| Control | Terminator X brings real-time fuel learn, high impedance injector drivers, an integrated 1 bar MAP sensor and four programmable inputs and outputs for fans, boost solenoids or progressive nitrous, with a 3.5 in. touchscreen handheld and full laptop software for advanced users. |
If the engine is together with a good carb intake and you mainly want drivability, a throttle body system is the cheaper path. If the intake is coming off anyway, go port injection.
Not sure what your Pontiac needs?
Email our tech team at tech@butlerperformance.com. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.