SKU: 83191920768

Holley LS Hi-Ram EFI Manifold - 300-123

Sale price$539.98 Regular price$599.98
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Description

Holley LS Hi-Ram EFI Manifold - 300-123Overview: 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 Aluminum
Construction Cast
Emission Code 3
Engine GM Small Block Gen III/IV (LS Based)
Finish Satin
Flange Style EFI
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:
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  • 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: 83191920768

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4.4 ★★★★★
Based on 8 reviews
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S
Verified Purchase
Suzanne
Draper, US
★★★★★ 5
Christmas gift for hubby
Color: Blue/Blue/Stainless Steel
Bought for my husband. He absolutely loves it. Only issue, No direction on how everything works. But he did figure it out after a couple of days playing with it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 13, 2024
I
Verified Purchase
Ivan
Los Angeles, US
★★★★★ 3
started fogging up inside after a couple of swimming sessions
Color: Black
Unfortunately, my watch started fogging up inside after just a couple of normal swimming sessions. I rinsed it with fresh water every time afterward and dried it with a towel, but later noticed moisture building up inside, and now I have to put it in rice to pull the condensation out. On the other hand, it’s hard to find good-looking classic-style watches with tide information, so I might just keep it as an everyday accessory rather than a watch for swimming.
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Reviewed in the United States on May 19, 2026
J
Verified Purchase
James W
Pawtucket, US
★★★★★ 5
Great watch for a great price.
Color: Green/Green
Watch is well made and keeps time accurate. Easy to charge and just keeps going. No surprises. If you like what you see and want a solar watch go for it. Sapphire Glass too.
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Reviewed in the United States on October 25, 2023
M
Verified Purchase
Max
Chelsea, US
★★★★★ 2
It was too good to be true
Color: Tan
I spoke too soon. Like with every Timex, this one was faulty, too. When the seconds hand reaches the 12 o'clock position (indicating the start of a new minute), the minutes hand should align precisely with a minute marker. That's how it should be. However, in the case of this particular watch, the minutes hand consistently lags behind, meaning it does not align correctly with the minute marker when the seconds hand hits the 12. No matter how precisely I align the minute hand when resetting the time, the minute hand eventually misaligns. Timex, I give up. ORIGINAL REVIEW: "Wow. After receiving 3 faulty, shoddily built Timex watches in a row, color me impressed. This looks good, feels good, and operates well. This is a great cheap alternative to the Khaki Field watch, IMO. The case is made of steel, not brass like many Timex watches. The glass is mineral, but here's something many watch enthusiasts don't tell you—mineral glass is more impact-resistant than sapphire crystal. Since you want a field watch to have more impact-resistant features, I'm okay with mineral glass. And here's the final bonus... the second hand actually hits all the markers. This may not be your experience, but with the one I got, it's hitting the marks perfectly. A lot of collectors obsess over specifications way too much. For me, as long as the watch functions properly, aesthetics and design are most important. And this watch has it. In person, this watch just looks really, really good. And for the price I got it at, it checks off the spec sheet too. Now, let's see how it holds up over time."
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Reviewed in the United States on June 24, 2024
B
Verified Purchase
Brian Rowland
Omaha, US
★★★★★ 5
Thumbs up
Color: Tan
Great watch for the $$$. Classy looking too.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 22, 2025

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