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Holley EFI 300-122 LS Hi-Ram EFI Intake Manifold for LS1/LS2/LS6

Part of: Holley EFI LS Hi-Ram Intake Manifold

Other options in this family: Holley EFI 300-122BK Holley EFI 300-123BK

Manufacturer

Picture for manufacturer Holley EFI

Part Number

300-122
6 reviews
Sale Price

$1,149.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Holley EFI 300-122 LS Hi-Ram EFI Manifold is a high-performance intake manifold engineered specifically for GM LS1, LS2, and LS6 engines. This precision-cast aluminum manifold features an optimized runner design that maximizes airflow and power output across the RPM range, making it an excellent choice for street/strip applications and high-horsepower builds.

Key Features & Specifications:

  • Optimized Port Design: 2.49" height x 1.21" wide ports engineered for maximum flow efficiency
  • Extended Runner Length: 6.58" runners with tapered cross-sectional area (4.25 in² to 2.53 in²) for improved torque and throttle response
  • Compact Profile: Base plenum mounting flange height of 8.42" from lifter valley cover flange
  • Complete Height: 12.32" total height with 92/102mm EFI plenum top installed
  • Integrated Throttle Body Mount: Optimally positioned at 25° angle, located 3.84" forward from engine block front flange
  • Quality Sealing: Uses 3/32" round O-ring cord for plenum top gasket and standard LS3 molded O-ring for mounting flange
  • Modular Design: Compatible with 92mm and 102mm EFI plenum tops for tuning flexibility

This Hi-Ram manifold design provides superior air distribution to all cylinders while maintaining compatibility with factory accessories and most engine bay configurations. The as-cast runner finish provides excellent flow characteristics, and the manifold is designed to work seamlessly with Holley EFI engine management systems for optimal performance and tuning capability.

Products specifications

Basic Operating RPM Range

3500-8000

Brand

Holley EFI

Category

Engine

CNC Ported

No

Color

Natural

Construction

Cast

Cylinder Head Port Shape

Cathedral

EGR Port

No

Emission Code

4

Engine

GM LS1/LS2/LS6

Flange Style

EFI

Fuel Injectors Included

No

Fuel Rail(s) Included

Yes

Fuel System Type

EFI

Gasket Or Seal Included

Yes

Grade Type

Performance

Intake Port Gasket(s) Included

No

Manifold Type

Hi-Ram

Material

Aluminum

Nitrous Bung(s) Included

No

Part Type

Engine Intake Manifold

Plenum Finish

Natural

Product Type

Intake Manifold

Recommended Use

Forced Induction

Removable Runners

No

Removable Top/Lid

Yes

Single Or Dual Plane Type

Single Plane

Sub Category

Cylinder Block Components

Throttle Body Bore Diameter

92 MM

Throttle Body Gasket Included

Yes

Throttle Body Included

No

Vacuum Ports

Yes

Warning

California Proposition 65

Warranty

Manufacturer's Limited 90 Day Warranty

easy ordering

Quick, and easy.

Great price; easy ordering and very timely delivery

Satisfied with entire process

Excellent. Fast and accurate.

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