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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Kathi C.
Bozeman, US
★★★★★ 5
Very versatile and easy to install too!
Size: 5.5 INCH
Very sturdy ! Worked perfect for our outdoor location and is holding the trellis to our home... WONDERFUL Support !
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2025
S
Verified Purchase
steve smith
Charlottesville, US
★★★★★ 5
Great Quality
Size: 9.25 INCH
Why did you pick this product vs others?: Looked sturdy and was a great price for heavy duty brackets
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Reviewed in the United States on June 20, 2025
A
Verified Purchase
Aj
Boise, US
★★★★★ 5
Keep ample supply of batteries nearby
Color: Graphite, Style: Keyboard
his keyboard does exactly what I needed it to do—stay quiet. No loud clack-clack echoing through calls, even on sensitive audio. It’s a solid choice if you’re working around microphones or just prefer a softer typing sound. Connectivity was easy, and it’s been reliable so far. The keys feel comfortable once you get into a rhythm. That said, the spacing is just slightly different from my previous keyboard—barely a millimeter or so—but it’s enough to throw you off at first. There’s definitely a short adjustment period before your fingers recalibrate. Also, it doesn't blow through batteries super fast, but I promise you'll want some spares handy because Murphy's Law dictates that you will be in the middle of something important when they go out! Overall, a dependable, low-noise keyboard that works well once you get used to the feel.
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Reviewed in the United States on May 5, 2026
B
Verified Purchase
BPalmer
Chelsea, US
★★★★★ 5
I am very happy!
Color: Graphite, Style: Keyboard
No issues. Keyboard works great and connects flawlessly to my laptop. Can't imagine any other problems. It does make a little clicky noise when typing but not overly loud or annoying and not as loud/annoying as my work computer keyboard. That keyboard has a very thin, plasticy, sharper, cheaper sounding click and this has a more subdued, heavier duty sounding click. I like it much better. It seems dampened maybe. It's hard to describe sounds but I find it way less annoying than any other keyboards I have used. I am extremely happy with its size and still having the full keyboard and numbers.
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Reviewed in the United States on December 28, 2025
A
Verified Purchase
Andy Bui
Cuba, US
★★★★★ 5
Simple, reliable, and very comfortable to use
Color: Graphite, Style: Keyboard
This keyboard is exactly what I was looking for. Setup was quick and easy, and the Bluetooth connection has been stable with no lag or dropouts. The keys are comfortable and quiet, making it great for everyday typing at home or in the office. I really like having the full numpad while still keeping a relatively compact size. The keyboard feels sturdy, and the spill-resistant design gives some peace of mind. Battery life has been excellent so far, and it works smoothly across both Windows and Mac. Overall, it’s a solid, no-frills keyboard that does its job well. Great quality and performance for the price.
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Reviewed in the United States on January 15, 2026

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