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HOLLEY LS1/2/6 Hi-Ram, Im Carb, Base Only

HOLLEY LS1/2/6 Hi-Ram, Im Carb, Base Only

Original price was: £652.64.Current price is: £620.02. Inc. VAT

SKU: HOL300-226BK Categories: , , Brand:

Description

Part Number: 300-226BK

Holley Modular Hi-Ram Lower Intake Manifold – GM LS1/LS2/LS6 (Black)

High-performance cast aluminum lower manifold base designed for GM LS cathedral port engines in high-RPM and boosted setups.

Product Overview

The Holley 300-226BK Modular Hi-Ram Lower Intake Manifold base delivers a cost-effective, race-proven alternative to fabricated sheet-metal induction systems. Engineered for GM LS1, LS2, and LS6 engines featuring cathedral port cylinder heads, this black cast aluminum lower base forms the core of a customizable induction setup where bonnet clearance is not limited.

Featuring a 6.58″ runner length with a tapered cross-sectional area, this intake base optimizes air velocity and cylinder filling across an aggressive power band of 3500 to 8000+ RPM. Whether running naturally aspirated or forced induction (turbocharged/supercharged), the modular base accepts a wide variety of Holley Hi-Ram EFI or carbureted top plenum plates to suit your specific motorsport build.

Key Features

  • ☑ Direct fitment for GM LS1, LS2, and LS6 cathedral port cylinder heads
  • ☑ Modular lower base design compatible with all Holley Hi-Ram plenum tops
  • ☑ Durable cast aluminum construction with an aggressive black finish
  • ☑ Tapered cross-section with 6.58″ runner length for high-RPM horsepower (3500-8000+ RPM)
  • ☑ Ideal foundation for both naturally aspirated and forced-induction race applications

Technical Specifications

Brand Holley
Manufacturer Part Number 300-226BK
Engine Compatibility GM LS1 / LS2 / LS6 (Cathedral Port)
Construction Material Cast Aluminum
Finish Black
RPM Power Band 3500 – 8000+ RPM
Runner Length 6.58″
Intake Port Dimensions 2.49″ H x 1.21″ W
Runner Cross-Sectional Area Tapered 4.25 in² to 2.53 in²

What’s Included in the Box

  • 1x Holley 300-226BK Modular Hi-Ram Lower Intake Manifold Base (Black)
  • Lower base mounting hardware and sealing hardware

When building a high-output LS engine, trust JP Racing for genuine Holley performance parts. Order your Holley 300-226BK today for competitive UK pricing, expert technical support, and fast UK delivery.

Frequently Asked Questions

The Holley 300-226BK lower manifold base is engineered specifically for GM LS family engines equipped with cathedral port cylinder heads, including LS1, LS2, LS6, and aftermarket cathedral port heads. It is not compatible with rectangular port heads such as LS3 or LS7.

Part 300-226BK is the modular lower intake manifold base only. To complete the intake system, you will need a compatible Holley Hi-Ram plenum top plate (such as dual 4500, single/dual 4150, or forward-facing EFI throttle body tops) along with corresponding fuel rails or throttle body adapters based on your application.

Yes, the Holley Hi-Ram cast aluminum lower base is extremely popular for high-boost turbocharged and supercharged LS builds. Its rigid cast structure easily withstands plenum pressure under heavy boost while delivering outstanding power at high engine speeds (3500 to 8000+ RPM).

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