SKU: 44351327302

Holley LS Hi-Ram EFI Manifold - Black - 300-123BK

Sale price$562.48 Regular price$624.98
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Description

Holley LS Hi-Ram EFI Manifold - Black - 300-123BKOverview: 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:

  • Base Plenum Top Mounting Flange Height – 8.42” to the lifter valley cover flange on engine block.
  • Total Height with 92/105mm EFI Plenum Top – 12.32” to the lifter valley cover flange on engine block.
  • Runner Length – 6.58”, As-Cast Runner Cross-Sectional Area – Tapered 4.25 in² to 2.53 in²
  • Throttle Body Flange Location, with 102mm EFI Plenum Top : Height – 8.42” (from engine block lifter valley cover flange), Longitudinal Location – 3.84” (forward from engine block front flange), Angle – 25 deg. (down from vertical)
  • Plenum Top Gasket Type – 3/32” Round O-ring Cord
  • Mounting Flange Gasket Type – Standard LS3 Molded O-Ring
  • Port Size – 2.49” Height x 1.21” Wide

 

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)
Finish Black
Front Height 12.32 inch
Fuel System Type EFI
Manifold Type Hi-Ram
Product Type Manifold
Rear Height 11.00 inch
RPM Power Band 1500-7000
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: 44351327302

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Michelle Allen
Houston, US
★★★★★ 5
Great socks
Size: Medium, Color: (025) Castlerock / Castlerock / Anthracite
Love these little socks. Soft and stay in place, no falling down in my shoe. I will definitely be buying more. Holding up well after multiple washings.
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Reviewed in the United States on October 8, 2025
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MOmasterG
Houston, US
★★★★★ 5
Great fit, no slip
Size: Medium, Color: (025) Castlerock / Castlerock / Anthracite
These looked too small for my feet, but now I love wearing them as they are comfortable and stay on my feet! They look great and the colors are easy to match. Excellent value for the money in my humble opinion.
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Reviewed in the United States on May 28, 2025
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Trussie Farve
Pawtucket, US
★★★★★ 4
Girls socks
Size: Small, Color: Neo Turquoise/Assorted
Girls socks. Quality good
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Reviewed in the United States on October 28, 2024
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Reviewer 67
Battle Creek, US
★★★★★ 5
Size perfect
Size: 4.5-7, Color: Electro Pink/Electro Tangerine/Electro Pink
Perfect fit
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Reviewed in the United States on April 13, 2026
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Tim
Natrona Heights, US
★★★★★ 5
good, worth the value
Size: Medium, Color: (025) Castlerock / Castlerock / Anthracite
Well it was delivered quick, and all my socks are mostly under armour, as they have developed holes in the heels now, so here i am getting a new set. they fit great, comfortable as usual. some folks may have some sort of issues, while some dont and i cannot complain. worth buying for sure. i recommend
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Reviewed in the United States on April 22, 2025

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