Holley EFI Gen III Hemi Hi-Ram EFI Manifold Base

2005–2020 Chrysler 300, 2006–2020 Dodge Charger, Challenger, Durango, Magnum, Jeep Grand Cherokee, 2009–2020 Ram 1500 / 2500 / 3500

300-653BK

Overview:

The Holley EFI Gen III Hemi Hi-Ram EFI Manifold Base is engineered for high-performance Gen III Hemi engines ranging from 5.7 to over 7.2 liters. Designed to maximize power output at high RPMs (7500-8500), this intake manifold base is ideal for naturally aspirated, forced induction, and nitrous applications. Its modular design allows builders and fabricators to customize induction systems by pairing the base with a variety of EFI tops, making it a versatile foundation for muscle cars, trucks, off-road vehicles, and more.

Compatible with a broad range of popular vehicles including Ram 1500, 2500, 3500 (2009–2020), Chrysler 300 (2005–2020), Dodge Challenger, Charger, Durango, Magnum, and Jeep Grand Cherokee, this manifold base is built to unlock the full potential of your Gen III Hemi engine.

Key Features:

Designed with performance and versatility in mind, the Holley Hi-Ram EFI Manifold Base offers numerous advanced features:

• EFI fuel rails machined for -8AN O-ring fittings with large passages to support high fuel flow and reduce pressure pulsations
• Positive Crankcase Ventilation (PCV) ports with adapter fittings for proper crankcase breathing
• Large intake ports (1.70” height x 1.88” width) compatible with 2009+ 5.7L, 2005–2010 6.1L, and 2011+ 6.4L Gen III Hemi engines
• Runner length and tapered cross-section optimized for a wide range of engine configurations and induction setups
• Port for OE-style Manifold Absolute Pressure (MAP) sensor (1 or 2 bar)
• Cast aluminum construction available in natural satin or black finish
• Compatibility with Gen III Hemi injectors and Bosch EV-1 style injectors
• Billet oil fill cap with a sleek, low-profile design
• Cast-in pads for easy addition of nitrous nozzles
• Large retained O-ring seals for superior OE-style sealing and easy replacement

Construction & Design:

The Holley Hi-Ram manifold base is crafted from high-quality cast aluminum, ensuring durability and excellent heat dissipation. Its robust construction supports aggressive driving conditions and high-performance demands. The design features large intake ports and tapered runners that optimize airflow velocity and volume, enhancing engine breathing and power delivery across a broad RPM range. The modular base allows for customization, making it an excellent choice for builders seeking to tailor induction systems to specific performance goals.

Installation & Fitment:

This manifold base is designed to fit a wide range of Gen III Hemi engines, including 5.7L, 6.1L, and 6.4L variants found in numerous Dodge, Chrysler, Jeep, and Ram models from 2005 through 2020. Installation requires standard intake manifold procedures and is compatible with factory-style fuel injectors and EFI components. The O-ring seal system simplifies installation and maintenance by providing reliable, leak-free sealing that is easy to service.

What's Included:

• Holley EFI Gen III Hemi Hi-Ram EFI Manifold Base
• EFI fuel rails with -8AN O-ring fittings
• Billet oil fill cap
• Adapter fittings for PCV ports
• Cast-in nitrous nozzle pads

Ideal For:

This manifold base is perfect for enthusiasts and professional builders aiming to maximize power on Gen III Hemi engines in muscle cars, drag racers, street rods, marine applications, off-road vehicles, sandrails, and pulling trucks. Its high-flow design and modularity make it suitable for naturally aspirated setups as well as forced induction and nitrous-boosted engines, providing flexibility for a wide range 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.