Holley Hi-Ram Lower Manifold - GM LS1/LS2/LS6 - 300-227BK
SKU: 684123817

Holley Hi-Ram Lower Manifold - GM LS1/LS2/LS6 - 300-227BK

Sale price$472.48 Regular price$524.98
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Description

Holley Hi-Ram Lower Manifold - GM LS1/LS2/LS6 - 300-227BKOverview: The Holley GM LS1 LS2 LS6 Modular Hi Ram Intake Manifold is introduced as a cost effective alternative to fabricated sheet metal for high performance applications where induction system height is not limited. Coupling this Hi Ram intake with the high flowing LS1 LS2 LS6 style cylinder heads has outstanding potential for N A and forced induction applications at a budget minded cost. Aggressive, bold, race bred styling will make bad intentions

Overview:

The Holley GM LS1/LS2/LS6 Modular Hi-Ram Intake Manifold is introduced as a cost effective alternative to fabricated sheet-metal for high-performance applications where induction system height is not limited. Coupling this Hi-Ram intake with the high flowing LS1/LS2/LS6 style cylinder heads has outstanding potential for N/A and forced induction applications at a budget-minded cost. Aggressive, bold, race-bred styling will make bad intentions clear for drag race, muscle car, marine, off-road, sandrails, pulling trucks, track, street-rod applications and more!  The base is designed to be modular in configuration to accept a wide range of carbureted and EFI tops and to be attractive to builders and fabricators as the foundation for custom induction systems.  Runner length and the tapered cross-section designed to perform well for a wide range of engine configurations  EFI fuel rails are machined for -8AN O-ring Fittings with passages large enough to accommodate high fuel flows and dampen pressure pulsations in the fuel system and come standard with EFI Hi-Ram kits.  Cast aluminum construction.  Intended for use on N/A or forced induction engines in the 6.0 to 7.0+ liter range, max power at 7000-8000+RPM.

Features:

  • Port Size – 2.49” Height x 1.21” Wide
  • Mounting Flange Gasket Type – Standard LS3 Molded O-Ring
  • Plenum Top Gasket Type – 3/32” Round O-ring Cord
  • Runner Length – 6.58”, As-Cast Runner Cross-Sectional Area – Tapered 4.25 in² to 2.53 in²
  • Black

 

Application:

Year Make Model Submodel Engine Size
Universal

 

Specs:

Brand Holley EFI
Color Black
Construction Cast
Emission Code 3
Engine GM Small Block Gen III/IV (LS Based)
Fuel System Type EFI
Product Type Manifold
Type of Component Lower Manifold
Warranty Limited 90 Day
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 684123817

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Apacs1
Lowell, US
★★★★★ 5
Fits perfectly
Size: 7.5" x 8.7" x 1.4"
easy to install
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 3, 2025
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ShakeAndBake
Draper, US
★★★★★ 5
bosch never disappoints
Size: 7.5" x 8.7" x 1.4"
good product+fair price=value for money
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Reviewed in the United States on January 12, 2026
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Blunt Bunny
Cuba, US
★★★★★ 5
First Rate Quality
Size: 7.5" x 8.7" x 1.4"
Easy installation; design of filter made installation mistake-proof.
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Reviewed in the United States on March 31, 2026
A
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Amazon Customer
Draper, US
★★★★★ 5
will buy again
Size: 7.5" x 8.7" x 1.4"
Works as expected and the fit was perfect.
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Reviewed in the United States on February 15, 2026
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Michael Nanninga
Port Orchard, US
★★★★★ 5
Great product!
Perfect fit and looks great!
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Reviewed in the United States on June 8, 2025

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