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Single-Plane EFI Intake Manifold for GM LS1 / LS2 / LS6 Cathedral-Port V8 – Holley 300-137 – Northline Parts
  • Single-Plane EFI Intake Manifold for GM LS1 / LS2 / LS6 Cathedral-Port V8 – Holley 300-137 – Northline Parts
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  • Single-Plane EFI Intake Manifold w/ Fuel Rails 300-137 For GM Gen LS1 LS2 LS6 - aftermarket replacement part from Northline Parts
  • Single-Plane EFI Intake Manifold w/ Fuel Rails 300-137 For GM Gen LS1 LS2 LS6 - aftermarket replacement part from Northline Parts
  • Single-Plane EFI Intake Manifold w/ Fuel Rails 300-137 For GM Gen LS1 LS2 LS6 - aftermarket replacement part from Northline Parts
  • Single-Plane EFI Intake Manifold w/ Fuel Rails 300-137 For GM Gen LS1 LS2 LS6 - aftermarket replacement part from Northline Parts
  • Single-Plane EFI Intake Manifold w/ Fuel Rails 300-137 For GM Gen LS1 LS2 LS6 - aftermarket replacement part from Northline Parts
Single-Plane EFI Intake Manifold for GM LS1 / LS2 / LS6 Cathedral-Port V8 – Holley 300-137

Single-Plane EFI Intake Manifold for GM LS1 / LS2 / LS6 Cathedral-Port V8 – Holley 300-137

SKU: NLT2S00040
$430.59 In Stock
$430.59
$430.59
Ships for free in 2–4 business days.
This single-plane EFI intake manifold is designed for GM LS Gen III/IV V8 engines with LS1, LS2, or LS6-style cathedral-port cylinder heads. References Holley-style part #300-137; confirm any fuel rails included in this particular listing.
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Compatible Models

We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.

Compatible equipment / model

Listed applications and configurations:

  • GM LS1 V8 — cathedral-port cylinder heads, EFI build
  • GM LS2 V8 — cathedral-port cylinder heads, EFI build
  • GM LS6 V8 — cathedral-port cylinder heads, EFI build
  • GM Gen III / IV LS V8 — cathedral-port heads, 4150 flange compatibility

Fitment note: Holley's base #300-137 does NOT include fuel rails and calls for rail kit #534-219. The original listing claims rails are included, so inspect the supplied photos/packing list before publishing this as a rail bundle. Not for rectangular-port LS3/L92 heads.

Product Overview

The cast-style intake directs air from a 4150-flange throttle body into the engine's eight intake ports for custom fuel-injected performance builds.

An aftermarket intake is an upgrade for a specific engine and tuning setup, not a direct replacement for every stock LS manifold. Injector mounting, throttle-body style and fuel delivery must be planned together.

Holley's base #300-137 does NOT include fuel rails and calls for rail kit #534-219. The original listing claims rails are included, so inspect the supplied photos/packing list before publishing this as a rail bundle. Not for rectangular-port LS3/L92 heads.

Key Features & Performance

  • Application: GM LS1 V8 — cathedral-port cylinder heads, EFI build.
  • Purpose: The cast-style intake directs air from a 4150-flange throttle body into the engine's eight intake ports for custom fuel-injected performance builds.
  • Identification: 300-137.

Specifications

  • Part / assembly: Single-Plane EFI Intake Manifold
  • Application / size: GM LS1 V8 — cathedral-port cylinder heads, EFI build
  • Reference number(s): 300-137
  • Northline Parts SKU: NLT2S00040

Replaces Part Numbers

  • 300-137

Part numbers listed here are identifiers for comparing components. Different formatting of the same number is not a separate interchange, and unrelated versions should not be assumed compatible.

What Is Included

The replacement component or kit pictured in this listing. Accessories, mounting hardware, fluids, and seals are included only when specifically shown or stated.

Installation & Fitment Notes

Holley's base #300-137 does NOT include fuel rails and calls for rail kit #534-219. The original listing claims rails are included, so inspect the supplied photos/packing list before publishing this as a rail bundle. Not for rectangular-port LS3/L92 heads.

Inspect related components during replacement and follow the equipment manufacturer’s procedures for fastener torque, alignment, sealing, and any required calibration or fluid service. Do not assume that installation supplies or fluids are included.

Frequently Asked Questions

Is this an OEM part?

No. Unless the product listing explicitly states otherwise, this is an aftermarket replacement. The manufacturer names and OE references identify applicable equipment, not the maker of this item.

How do I check fitment?

Holley's base #300-137 does NOT include fuel rails and calls for rail kit #534-219. The original listing claims rails are included, so inspect the supplied photos/packing list before publishing this as a rail bundle. Not for rectangular-port LS3/L92 heads.

What if my model year appears above but the part looks different?

Do not install it based on the model year alone. Factory equipment changes by engine, build date, trim, mounting style, and option package. Match the original part number and physical connections first.

Part Summary

Part: Single-Plane EFI Intake Manifold

Applications: GM LS1 V8 — cathedral-port cylinder heads, EFI build; GM LS2 V8 — cathedral-port cylinder heads, EFI build; GM LS6 V8 — cathedral-port cylinder heads, EFI build; GM Gen III / IV LS V8 — cathedral-port heads, 4150 flange compatibility

Reference Numbers: 300-137

Purpose: The cast-style intake directs air from a 4150-flange throttle body into the engine's eight intake ports for custom fuel-injected performance builds.

Northline Parts SKU: NLT2S00040

Keywords: Single-Plane EFI Intake Manifold, Single-Plane EFI Intake Manifold for GM LS1 / LS2 / LS6 Cathedral-Port V8 – Holley 300-137, NLT2S00040, Northline Parts, 300-137, GM LS1 V8 — cathedral-port cylinder heads, EFI build, GM LS2 V8 — cathedral-port cylinder heads, EFI build, GM LS6 V8 — cathedral-port cylinder heads, EFI build, GM Gen III / IV LS V8 — cathedral-port heads, 4150 flange compatibility.

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