Holley EFI Gen III Hemi Hi-Ram EFI Manifold Base

2005–2020 Chrysler / Dodge / Jeep / Ram Models with Gen III Hemi Engines

300-653

Overview:

The Holley EFI Gen III Hemi Hi-Ram EFI Manifold Base is engineered for high-performance enthusiasts seeking to maximize power on Chrysler, Dodge, Jeep, and Ram vehicles equipped with Gen III Hemi engines. Designed to fit a broad range of models from 2005 through 2020, this intake manifold base supports naturally aspirated, forced induction, and nitrous applications in engines ranging from 5.7 to over 7.2 liters. Its modular design allows for customization with various EFI tops, making it an ideal foundation for builders and fabricators aiming to create powerful, race-ready induction systems.

With large intake ports optimized for 2009-up 5.7L, 2005-2010 6.1L, and 2011-up 6.4L Gen III Hemi engines, the Hi-Ram manifold base delivers exceptional airflow and fuel delivery capabilities. Its aggressive styling complements muscle cars, drag racers, off-road vehicles, and street rods alike, making a bold statement under the hood while providing serious performance gains.

Key Features:

This Holley Hi-Ram EFI manifold base combines advanced engineering with practical features to enhance engine performance and reliability:

• Compatible with Gen III Hemi engines featuring large intake ports (1.70” height x 1.88” wide)
• Includes EFI fuel rails machined for -8AN O-ring fittings, designed for high fuel flow and pressure pulsation damping
• Port for OE style Manifold Absolute Pressure (MAP) sensor (1 or 2 Bar) for precise tuning
• Modular manifold base designed to accept a wide range of EFI tops for custom induction setups
• Large retained O-ring seals provide superior OE-style sealing and ease of maintenance
• Runner length and tapered cross-section optimized for a variety of engine configurations and RPM ranges (max power at 7500-8500 RPM)
• Billet oil fill cap with a low-profile, race-inspired design
• Cast aluminum construction available in natural satin or black finish for durability and style
• Compatible with Gen III Hemi and Bosch EV-1 style fuel injectors
• Cast-in pads for nitrous nozzle installation and positive crankcase ventilation (PVC) ports with adapter fittings

Construction & Design:

Crafted from high-quality cast aluminum, the Holley Hi-Ram manifold base offers a robust yet lightweight solution engineered for performance and longevity. The satin or black finish not only enhances corrosion resistance but also adds a sleek, race-ready appearance. Its large intake ports and carefully designed runner geometry optimize airflow to support high RPM power delivery, while the modular base design provides flexibility for custom EFI configurations. The inclusion of large O-ring seals ensures a reliable, leak-free connection to the cylinder heads, maintaining consistent performance under demanding conditions.

Installation & Fitment:

The Holley EFI Gen III Hemi Hi-Ram EFI Manifold Base is designed for direct fitment on a wide range of Chrysler, Dodge, Jeep, and Ram vehicles equipped with Gen III Hemi engines. Compatible models include Ram 1500, 2500, and 3500 (2011–2020), Chrysler 300 (2005–2020), Dodge Ram 1500, 2500, and 3500 (2009–2010), Dodge Challenger and Challenger SRT (2008–2020), Dodge Charger (2006–2020), Dodge Durango and Durango SRT (2009–2020), Dodge Magnum (2006–2008), and Jeep Grand Cherokee and Grand Cherokee SRT (2006–2020).

Installation typically requires standard intake manifold procedures and may involve tuning adjustments to optimize fuel delivery and ignition timing. The modular design allows builders to pair this base with various EFI tops, enabling custom setups tailored to specific performance goals.

What's Included:

• Holley EFI Gen III Hemi Hi-Ram EFI Manifold Base
• EFI fuel rails with -8 AN O-ring fittings
• Billet oil fill cap
• O-ring seals for cylinder head interface
• Adapter fittings for PVC ports

Ideal For:

This manifold base is perfect for performance enthusiasts, racers, and custom builders working with Gen III Hemi engines who demand maximum airflow and fuel delivery for naturally aspirated, forced induction, or nitrous-boosted setups. It suits applications ranging from drag racing and muscle cars to marine, off-road, sandrails, pulling trucks, and street rods, offering versatility and power potential across a wide spectrum of high-performance builds.

Holley EFI delivers standalone engine management and EFI systems built for everything from engine swaps to serious horsepower builds. With platforms like Sniper, Terminator X, HP, and Dominator, Holley EFI is aimed at enthusiasts who want modern tuning control, data, and drivability—whether it’s a street car, track car, or full-on race program.