Description
Dual Plane Performance. The Holley GM LS3/L92 Dual Plane Carbureted Intake Manifold is engineered to convert GM LS Gen III/IV engines with LS3/L92 style rectangular port heads to carburetors, improving low-end torque and supporting power output up to 6,500 RPM. It is intended for carbureted racing or off-road applications where emissions compliance is not required.
Construction and Appearance. Manufactured from cast aluminum, this intake manifold features an efficient casting design that ensures light weight and consistent wall thickness for improved durability and quality. It has a natural finish with a smooth surface and an optimized port layout designed specifically for rectangular LS3/L92 style cylinder heads.
Installation. Installation is straightforward with no special modifications such as drilling required. The included O-ring style sealing gaskets provide an OEM-style seal, facilitating ease of installation in LS engine applications.
Warranty. This manifold comes with a manufacturer’s limited 90-day warranty that covers initial product quality and performance.
Application. Designed for GM LS Gen III and IV engines with LS3/L92 rectangular port cylinder heads. Note that this product is intended for racing use only (Emission Code 4) and is not legal for street use in areas subject to emissions regulations. The manifold fits a broad range of LS engine applications and features dimensions that allow installation in vehicles requiring minimal modifications.
Holley 300-129
CA Residents: WARNING: Cancer and Reproductive Harm
- Compatible with GM LS Gen III and IV Engines Equipped with LS3/L92 Style Rectangular Port Cylinder Heads
- Dual Plane Design Enhances Low-End Torque While Supporting Power Output up to 6,500 RPM
- O-Ring Cylinder Head Mounting Flange Gaskets Provide OEM-Style Seal and Ease of Installation
- Optimized Runner Layout with Constant Cross Sectional Area for a Broad Torque Curve
- Port Size: 2.454″ Height x 1.09″ Width
- Power Band: 1500-6500 RPM
- Includes Viton® O-Rings
- Weight: 14.56 lbs
- Front Height: 5.07″ From Front Lifter Valley Cover to Carburetor Mounting Flange
- 4150 Square Bore Carburetor Mounting Flange
- Minimal Carb Flange Height for Fitment in Vehicles with Limited Hood Clearance
- Rear Height: 6.14″ From Rear Lifter Valley Cover to Carburetor Mounting Flange
- Suitable for Carbureted Street Applications (Note: Designed for Carburetor Use on Racing or Off-Road Vehicles Due to Emissions Status)
- Cast Aluminum Construction with Efficient Casting Design for Lightweight and Improved Quality
- Carburetor Flange Type: Square/4150
- Deck Height: 9.24 Inches
- Cylinder Head Port Shape: Rectangle
- Fuel System Type: Carbureted
- Includes Vacuum Ports
- Product is a Dual Plane Intake Manifold (Disregard Conflicting Single Plane Reference in Specification)
- Throttle Body Bore Diameter: 3.6 Inches
- Does Not Include Carburetor Studs, Fuel Injectors, Fuel Rails, Gaskets, Nitrous Bungs, Removable Runners or Tops, or Throttle Body
- Manufacturers Limited 90-Day Warranty Included
- Emission Code: 4 (For Racing Use Only – Not Legal for Emissions Controlled Vehicles)
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