- Holley Single Plane Intake Manifold is designed for carbureted GM LS Gen III and IV engines equipped with LS1, LS2, or LS6 cathedral port cylinder heads, delivering strong mid-range power and top-end performance
- Features a 4150 square-bore carburetor flange that supports throttle bores up to 1.75 inches in diameter
- Engineered with optimized runners and a consistent cross-sectional area to provide a wide usable powerband from approximately 2,500 to 7,000 RPM
- Constructed from cast aluminum with an efficient casting process and uniform wall thickness, weighing approximately 11.5 pounds
- Low carburetor flange height helps accommodate installations where hood clearance is limited; port openings measure 2.659 inches tall by 0.918 inches wide
- Supplied with durable Viton O-ring intake-to-cylinder-head gaskets and compatible with centrifugal superchargers, turbocharger setups, or nitrous oxide systems
- Covered by a 1-Year Limited Warranty
If your LS combination is built for aggressive acceleration and strong upper-RPM performance, intake manifold selection is critical. A properly engineered single-plane design can enhance throttle response and airflow, whether you are making passes at the track or pushing your street car to its limits. The Holley Single Plane Intake Manifold is developed to help maximize the performance potential of your setup.
This carbureted single-plane intake is designed for GM LS Gen III and Gen IV engines equipped with LS1, LS2, or LS6 cathedral port cylinder heads. It features a 4150 square-bore carburetor flange that accommodates throttle bores up to 1.75 inches in diameter. The runner configuration maintains a consistent cross-sectional area and optimized layout to support a wide powerband, delivering strong performance from approximately 2500 to 7000 RPM. Cast from aluminum with uniform wall thickness and an efficient overall design, the manifold weighs about 11.5 pounds. Its low-profile carb flange height helps reduce the need for extensive hood modifications. Port dimensions measure 2.659 inches tall by 0.918 inches wide.
Viton O-ring gaskets for the intake-to-cylinder-head seal are included. The robust aluminum construction makes this manifold suitable for naturally aspirated builds as well as combinations using centrifugal superchargers, turbochargers, or nitrous oxide systems. This product is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles, including 1965 and older California-certified vehicles, 1967 and older federally certified vehicles, and 1967 and older foreign-manufactured vehicles. Installation on Emissions Controlled Vehicles—such as 1966 and newer California-certified vehicles, 1968 and newer federally certified vehicles, and 1968 and newer foreign-manufactured vehicles—is prohibited by law. Backed by a 1-Year Limited Warranty.