Description
The new single plane intake manifold is designed to provide a broad RPM powerband for high-performance street/strip engine applications to a maximum engine speed of 7500 RPM. The carburetor-mounting pad is designed to accept all stock or aftermarket square-bore carburetors with manual or electric chokes. These intake manifolds are designed to accept most stock hardware and accessory brackets, but offer performance features; like an updated plenum divider area, a 1″ shorter height than the 300-25 manifold, and a choice of two distributor clamp locations. The isolated design of the air/fuel passages helps to increase charge air density and performance. The 300-261 intake manifolds are designed for square-bore carburetor applications on 1957-86 262-400cid Small Block Chevrolet engines and SBC engines equipped with 1987-91 L98 aluminum Corvette cylinder heads (non-EGR applications). Also, these manifolds will work with any SBC engine equipped with aftermarket cylinder heads, as long as they have a standard port flange opening and mounting bolt locations.
Resources
Installation Instructions
Specifications:
| Cylinder Head Type | LS1/LS2/LS6 |
| Description_ASC | Holley Performance Emission Code 3: This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: 1965 and older U.S. manufactured California Certified vehicles/1967 and older U.S. manufactured Federally Certified vehicles/1967 and older Foreign manufactured vehicle. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle |
| Description_DEF | Engine Intake Manifold |
| Description_DES | Single Plane Intake Manifold Kit |
| Description_EXT | Single Plane Intake Manifold Kit; Carbureted; w/Cathedral Port Cyl. Heads; Front Height/Rear 7.32 in.; RPM Power Band 2500-7000; Black Finish; For Use w/LS1/LS2/LS6; |
| Description_FAB | Isolated Water Cross-Over |
| Description_FAB | Power Band 2500-7000 RPM |
| Description_FAB | Single Plane With Isolated Plenum |
| Description_FAB | Square Bore Carburetor Mounting Flange |
| Description_INV | INT MNFD CATHEDRAL SPLIT SGL-PLN EFI-BLA |
| Description_MKT | The new Holley Single-Plane Race intake manifold were designed with performance in mind. They feature a race bred, two piece split feature that was previously only found on the most expensive race intakes. The manifold will fit GM LS Gen III engines with cathedral port heads and are intended for 4150 style square bore flanged carburetors or throttle body EFI.The LS Race single-plane intake manifold was designed for hi-performance/racing engine applications, 5.3 to 6.2+ liter displacement, and maximum engine speeds of 6000-7000 rpm, depending on the engine combination. This single-plane design provides optimal performance across the RPM spectrum while providing maximum performance up to 7000 rpm.The Holley LS Race manifold incorporates a split feature, which allows disassembly of the intake for direct access to internal plenum and port surfaces, making custom porting and matching a snap. With shoulder bolt locators and O-ring seal, reassembly is simple and precise. Technical Data‚· A-B Height – 7.32 in. (0° carb flange angle)ï‚· Port Size- 3.28 in. Height x 1.10 in. Wide‚· Throttle Body Flange – Standard 4150 for up to 1-3/4 in. diameter throttle boresï‚· As-Cast Runner Cross-Sectional Area – 3.5 in² at the runner entry tapered to 2.9 in² at the flange exit |
| Description_MKT | The new single plane intake manifold is designed to provide a broad RPM powerband for high-performance street/strip engine applications to a maximum engine speed of 7500 RPM. The carburetor-mounting pad is designed to accept all stock or aftermarket square-bore carburetors with manual or electric chokes. These intake manifolds are designed to accept most stock hardware and accessory brackets, but offer performance features; like an updated plenum divider area, a 1″ shorter height than the 300-25 manifold, and a choice of two distributor clamp locations. The isolated design of the air/fuel passages helps to increase charge air density and performance. The 300-261 intake manifolds are designed for square-bore carburetor applications on 1957-86 262-400cid Small Block Chevrolet engines and SBC engines equipped with 1987-91 L98 aluminum Corvette cylinder heads (non-EGR applications). Also, these manifolds will work with any SBC engine equipped with aftermarket cylinder heads, as long as they have a standard port flange opening and mounting bolt locations. |
| Description_SHO | Intake Manifold |
| Engine Make/Size | Chevy LS1/2/6 |
| height | 10.0 |
| length | 23.2 |
| Position | Lower |
| RPM Range | 2500-7000 |
| Usage | Racing |
| WARNING CA Proposition 65 | No |
| weight | 21.15 |
| width | 14.4 |
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