New Single-Plane Intake Manifold for Gen III Hemi

03/07/2024

New Single-Plane Intake Manifold for Gen III Hemi

03/07/2024

Holley’s new Gen III Hemi single-plane intake manifold kits bring traditional-style induction choices to 2009-2024 5.7-liter, 2005-2010 6.1-liter, and 2011-2024 6.4-liter Chrysler Gen III Hemis. Crafted with a single-plane design and constant-cross-section runners, this manifold is designed to provide excellent drivability, with a broad torque curve and potent upper-end power.

At the same time, its 4150 flange maximizes its versatility. The manifold is available in two distinct configurations. The 300-930 variant, designed for port fuel injection, includes a comprehensive fuel rail kit. The 300-931 version is a dedicated casting aimed at carbureted/TB EFI applications, omitting injector and fuel rail mounting bosses for a clean, classic look.

Along with these attributes, these manifolds address the perennial issue of underhood clearance, with their minimal carb/throttle-body flange height. This strategic engineering choice ensures an easy fit within the confines of a stock or mildly modified hood, eliminating the headache of clearance issues. But if there is extra space available, the characteristics of the manifold can be tuned using traditional carb/throttle-body spacers to optimize the engine's performance.

“These manifolds are specifically designed for swapping,” says Dralle. “While providing performance, the intention is to offer solid solutions to enthusiasts for those projects. The same applies to Holley EFI, accessory drives, swap oil pans, and exhaust products. We provide products for the engine interface to their car or truck.”

Engineering

From parts manufacturers to gearheads, everyone is looking to push the envelope of what vehicles can do and improve on what’s already there. This was the case with Holley’s team when designing the single-plane intake manifold for Chrysler Gen III Hemi engines. “We spend time looking at what would best meet customer needs,” explains Dralle. “Our product development team determines the required attributes of the intake manifold to give the best solution for the customer.

“A developed problem statement is passed to our engineering team,” continues Dralle. This determines the best configuration and specifications such as runner type, constant CSA [cross-sectional area] or tapered, the CSA size, the runner layout, and plenum size/depth, among other things. In some respects, there’s a level of creativity and in others, good design practice is used to provide the proper interface of the intake manifold to the engine, the throttle body, injectors, and fuel rails.”

Once the basic design was established, prototypes of the manifold were built and evaluated to determine if it lived up to expectations and was ready to be added to the Holley product line. “Once a design is fleshed out, we prototype the product using various methods, usually done in-house at Holley. The design is reviewed and tested. If we believe that the product will satisfy the customer’s desires, we put it into production.”

The end result is a product that brings greater functionality to the proven Gen III Hemi platform, while opening up new options for swapping these engines into a wide range of vehicles. “This manifold provides a traditional look of a classic muscle car or truck and a simplicity of installation into cars and trucks that originally had a carbureted engine,” notes Dralle. “Items such as throttle linkages, air cleaners, and other items or attachments are simple and familiar with this type of intake manifold. These manifolds are packed with features that make them right for any build.”