Description
High Performance Intake. The Holley GM LS3/L92 dual plane carbureted intake manifold enhances throttle response and low-end torque for GM LS engines. It offers a straightforward solution for converting LS engines to carbureted setups, delivering a reliable power band from 1500 to 6500 RPM suitable for racing applications where emissions compliance is not required.
Construction and Appearance. Made from cast aluminum, this intake manifold features a natural finish with consistent wall thicknesses for durability and quality. Its design includes an optimized runner layout and a robust O-ring sealing system, making it lightweight yet effective for performance use.
Installation. Installation is simplified with OEM-style O-ring mounting flange gaskets that allow a smooth bolt-on process to LS3 or LS92 cylinder heads without the need for modifications or drilling.
Warranty. Comes with a manufacturer’s limited 90-day warranty. Application. Designed for GM LS Gen III and IV engines with LS3/L92 style rectangular port cylinder heads, intended exclusively for use on racing vehicles and not for street or emissions-controlled operation.
Holley 300-129
CA Residents: WARNING: Cancer and Reproductive Harm
- Compatible with all GM LS Gen III and IV engines equipped with LS3/L92 style rectangular port cylinder heads
- Legal for sale or use only on racing use vehicles; not for emissions-controlled or street-legal applications
- Dual plane design delivers enhanced low-end torque with power up to 6500 RPM
- O-ring cylinder head mounting flange gaskets provide an OEM-style seal
- Optimized runner layout with constant cross-sectional area supports a broad torque curve
- Intake port dimensions: 2.454 inches height by 1.09 inches width
- Includes Viton® O-rings for improved durability and sealing performance
- Weighs 14.56 pounds
- Front height: 5.07 inches from front lifter valley cover to carburetor mounting flange
- 4150 square bore carburetor mounting flange with minimum flange height
- Rear height: 6.14 inches from rear lifter valley cover to carburetor mounting flange
- Suitable for carbureted applications; designed specifically for 4150-style carburetor flange use
- Cast aluminum construction ensures lightweight design, consistent wall thickness, and improved quality
- Includes vacuum ports
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