Holley 300-291 Single Plane Split-Design Race Intake Manifold- GM LS3/L92-4150 Carbureted Single Plane Split-Design Race Intake

? A-B Height - 7.25 inch (0 carb flange angle) Technical Data: ?

Port Size- 2.59 inch Height x 1.28 inch Wide 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.

? Carburetor Flange - Standard 4150 for up to 1-3/4 inch diameter throttle bores 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 LS3/L92 heads and are intended for 4150 style square bore flanged carburetors or throttle body EFI.

? As-Cast Runner Cross-Sectional Area - 4.5 in2 at the runner entry tapered to 3.2 in2 at the flange exit

Features and Benefits:

• Split feature making porting efforts easy! Lighter than other split race intakes Vacuum Port options include (2) 1/8, (1) 1/4, and (1) 3/8, NPT ports at the carb flange Maximum performance race design with hood clearance consideration Captured O-ring seals at head ports and split 33 to 50 percent the price of other split race intakes

Details:

• Barrel Quantity: 4.0
• Basic Operating RPM Range: 2500-7500 RPM
• Cnc Ported: No
• Carburetor Flange: Square/4150
• Carburetor Quantity: 1.0
• Carburetor Studs Included: No
• Color: Natural
• Construction: Cast
• Cylinder Head Port Shape: Rectangle
• Deck Height: 9.24 Inch
• EGR Port: No
• Engine: GM LS3/L92
• Flange Style: 4150 Square Bore
• Front Maximum Height: 7.25 Inch
• Fuel Injectors Included: No
• Fuel Rail(s) Included: No
• Fuel System Type: Carb
• Gasket Or Seal Included: No
• Grade Type: Performance
• Intake Port Gasket(s) Included: No
• Manifold Type: Split Single Plane
• Material: Aluminum
• Nitrous Bung(s) Included: No
• Plenum Finish: Natural
• Rear Maximum Height: 7.25 Inch
• Recommended Use: Forced Induction
• Removable Runners: No
• Removable Top/Lid: No
• Single Or Dual Plane Type: Single Plane
• Throttle Body Bore Diameter: 3.6
• Throttle Body Gasket Included: No
• Throttle Body Included: No
• Vacuum Ports: Yes

Installation Guide: Download PDF

Installation / Product Video: Watch on YouTube

⚠️ California Proposition 65 Warning
California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.

Warranty: Manufacturer's Limited 90 Day Warranty