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Multi-Port EFI Systems
For the serious Pontiac V8 builder, particularly those aiming for $600\text{hp}$ and beyond, or those who simply demand the ultimate in fuel control, Multi-Port Fuel Injection (MPFI) is the undisputed superior choice over Throttle Body Injection (TBI).
Butler Performance provides complete Multi-Port EFI Solutions, leveraging cutting-edge systems from industry leaders like Edelbrock (Pro-Flo 4) and Holley (Terminator X).1 These packages go far beyond simple bolt-ons, offering the highest level of fuel delivery precision for any performance-built 326, 350, 389, 400, 421, 428, and 455 Pontiac engine.
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Why Multi-Port Reigns Supreme
While TBI systems (which look like a carburetor) are simple and effective for moderate street performance, Multi-Port EFI systems offer fundamental advantages for high-performance engines:
The key takeaway is precision. MPFI ensures that every cylinder receives the exact air/fuel mixture required, maximizing power, lowering emissions, and preventing detonation.
Butler's Featured Multi-Port Solutions
Butler Performance specializes in packaging MPFI systems designed for the unique needs of the Pontiac V8:
1. Edelbrock Pro-Flo 4 Multi-Port
The Pro-Flo 4 system is a self-learning MPFI solution that is highly recommended for builders seeking excellent street performance with high-end control.
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Integrated Intake: The system comes with a dedicated 4150-style intake manifold specifically designed for the Pontiac engine, featuring bosses for the injectors at the end of each runner.
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Plug-and-Play Ignition: The system includes a dedicated plug-and-play distributor designed to communicate directly with the ECU, providing full timing control.
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Self-Learning: Like TBI systems, the Pro-Flo 4 utilizes a wide-band O2 sensor and an app (E-Tuner 4) to self-tune the base fuel map, dramatically simplifying initial setup.
2. Holley Terminator X and FAST XFI Custom Kits
For maximum control, racing applications, or power-adder setups, Butler Performance offers custom kits using advanced ECU systems:
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Holley Terminator X MPFI: This system is highly tunable, offering the ability to run sequential injection and providing advanced features like boost control, progressive nitrous control, and individual cylinder timing and fuel adjustments. This is the choice for builders pushing power limits.
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FAST XFI Sportsman / XFI 2.0: These kits offer similar high-level control and are packaged with Butler’s selection of matched fuel rails, injectors, and sensors to ensure perfect fitment on a Pontiac engine.
The Complete Butler Package: Fueling the Beast
All of Butler Performance's Multi-Port EFI systems are available as a Complete EFI Solution Kit. This addresses the single greatest hurdle of EFI conversion: the high-pressure fuel supply.
The complete kits include:
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The MPFI System: (e.g., Pro-Flo 4, Terminator X) with injectors, manifold, throttle body, and ECU.
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EFI-Ready Fuel Tank: A factory replacement fuel tank featuring internal baffling and a pre-installed, high-flow electric fuel pump (e.g., ) for reliable, quiet operation.
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High-Pressure Plumbing: All necessary high-pressure fuel lines, fittings, and regulator hardware to connect the new tank to the injectors.
By choosing a Multi-Port EFI system from Butler Performance, enthusiasts gain the ultimate in modern fuel delivery precision, ensuring their high-performance Pontiac V8 is running at its absolute peak, from idle to redline.