SKU: 54939055477

Holley Hi-Ram Lower Manifold - GM LT1 - 300-237

Sale price$350.98 Regular price$389.98
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Ships within 48 hours · Estimated delivery Jul 20 - Jul 25

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Description

Holley Hi-Ram Lower Manifold - GM LT1 - 300-237Overview: The new Holley EFI Hi Ram intake provides the ultimate performance with the new GM direct injected Gen V 6. 2L LT1 engine. The modular design of this manifold allows easy disassembly for custom porting, multiple tops, or custom induction systems. Each runner has a large radius where it meets the plenum, and optimized taper & cross sectional area to perform in a wide variety of engine configurations. The optional injector bosses on the intake

Overview:

The new Holley EFI Hi-Ram intake provides the ultimate performance with the new GM direct injected Gen V 6.2L LT1 engine. The modular design of this manifold allows easy disassembly for custom porting, multiple tops, or custom induction systems. Each runner has a large radius where it meets the plenum, and optimized taper & cross-sectional area to perform in a wide variety of engine configurations. The optional injector bosses on the intake runners allow increased performance potential by using additional injectors along with the factory direct injection. When you look for the pinnacle of performance, price, and quality, look to Holley EFI.

Features:

  • Modular Design w/ Removable Top
  • Overall Height: 13.34” (w/ EFI Top - 95mm or 105mm) – See Drawing
  • A-B Height: 12.10” (w/ Carb Style Top - 2 x 4150 or 2 x 4500) – See Drawing
  • Height at Plenum Flange: 9.44”
  • Port Size: 2.06” High x 1.53” Wide
  • Runner Length: Approx. 6.5”
  • Large Plenum Volume of 549 Cubic Inches (w/ 1 x 95mm or 1 x 105mm Throttle Body Top)
  • Available With or Without Injector Ports in the Runners
  • Intakes w/ Injector Ports Include Fuel Rails w/ Dual Mounting (1.48” or 2.56” O-ring to O-ring injector length)
  • Fuel Rails are Anodized, Laser Etched, and Machined for 8AN O-Ring Fittings at Each End
  • Rear of Plenum Machined for MAP & 3 Vacuum Ports
  • Head Flange has Clearance for Fuel Supply to High Pressure Pump
  • Increased Runner Wall Thickness for Custom Porting at the Plenum to Runner Entry on Each Runner
  • O-Ring Seals at Cylinder Heads & Plenum Top
  • Easy Assembly w/ Top Mounted Screws on Plenum Top (all except front 2 screws)
  • Several Top Options: 1 x 95mm, 1 x 105mm, 2 x 4150, 2 x 4500, or Blank Flange for Custom Throttle Bodies
  • 3500-8000+ RPM Power Band

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Brand Holley EFI
Construction Cast
Emission Code 3
Engine GM Gen V LT1
Finish Satin
Manifold Type Hi-Ram
Product Type Intake Manifold
RPM Power Band 3500-8000+
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: 54939055477

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C
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CWD
Belleville, US
★★★★★ 5
Great brackets for miter saw table
Size: 8 Inch, Size: 8 Inch
Used these brackets to make a fold out shelf for my miter saw table
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
D
Verified Purchase
Dan M.
Carnegie, US
★★★★★ 5
Great light duty hinges
Size: 10 Inch
These worked great for my miter saw table foldable extensions. Smooth with solid and locking mechanisms
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 1, 2026
K
Verified Purchase
Kriss Michaud
Boise, US
★★★★★ 4
Almost perfect
Size: 16 Inch, Size: 16 Inch
Only reason I gave it 4 stars is, they aren’t exactly 90 degrees. I used them on a work bench and I could shim them to be right. If these were a critical component they would be off.
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Reviewed in the United States on February 21, 2026
B
Verified Purchase
bruce thornell
Chelsea, US
★★★★★ 5
Does what it says
Size: 10 Inch
Does what it says and holds up
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Reviewed in the United States on May 21, 2026
A
Verified Purchase
Amazon Customer
Carnegie, US
★★★★★ 5
Just as described
Size: 20 Inch
Easy installation. All parts are included.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026

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