My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Holley EFI 300-137 Single Plane EFI Intake Manifold GM LS1/LS2/LS6

Part of: Holley EFI Single Plane Intake Manifold GM

Other options in this family: Holley EFI 300-136 Holley EFI 300-269BK Holley EFI 300-136BK

Manufacturer

Picture for manufacturer Holley EFI

Part Number

300-137
9 reviews
Sale Price

$510.95

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Holley EFI 300-137 is a high-performance single plane EFI intake manifold engineered specifically for GM LS1, LS2, and LS6 engines. This cast aluminum manifold features an optimized runner layout with constant cross-sectional area, delivering a broad torque curve and exceptional vehicle performance across a 2500-7000 RPM power band.

Key Features:

  • 4150 square bore flange for compatibility with a wide range of throttle bodies
  • Efficient casting design with lightweight construction at only 11.5 lbs
  • Port dimensions: 2.50" height x 1.15" width for optimal flow characteristics
  • Minimum carb flange height allows installation with minimal hood modifications
  • Front height of 5.417" measured to lifter valley cover flange at engine block front
  • Cast aluminum construction ideal for centrifugal blower, turbocharged, or nitrous applications
  • Includes Viton® O-ring intake-to-cylinder head gaskets for superior sealing
  • Consistent wall thicknesses throughout for improved casting quality and durability

Important Note: This intake manifold does not work with factory fuel rails and requires the use of Holley Fuel Rail Kit P/N 534-219 (sold separately).

Whether you're building a naturally aspirated street engine or a forced induction monster, the Holley EFI 300-137 delivers the airflow and performance characteristics needed to maximize power output across a wide RPM range.

Products specifications

Basic Operating RPM Range

2500-7000

Brand

Holley EFI

Carburetor Flange

Square/4150

Carburetor Quantity

1

Carburetor Studs Included

No

Category

Engine

CNC Ported

No

Color

Silver

Construction

Cast

Cylinder Head Port Shape

Cathedral

EGR Port

No

Emission Code

3

Engine

GM LS1/LS2/LS6

Flange Style

4150 Square Bore

Fuel Injectors Included

No

Fuel Rail(s) Included

No

Fuel System Type

EFI

Gasket Or Seal Included

Yes

Grade Type

Performance

Intake Port Gasket(s) Included

No

Manifold Type

Single Plane

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

No

Single Or Dual Plane Type

Single Plane

Sub Category

Cylinder Block Components

Throttle Body Bore Diameter

3.6

Throttle Body Gasket Included

No

Throttle Body Included

No

Vacuum Ports

Yes

Warning

California Proposition 65

Warranty

Manufacturer's Limited 90 Day Warranty

Great price, super fast shipping.

I just never do top scores

Thanks for having the original part.

Just perfected 3 more

Verygood costomer serv.well done .

Great

Ordered got shipped out quick came in time overall very satisfied and will recommend to all my jeep club friends for there off road needs

It was easy.

Awesome

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy