Holley 300-255BK Single Plane EFI Split-Design Race Intake Manifold- GM LS1/LS2/LS6-Black EFI Single Plane Split-Design Race

? As-Cast Runner Cross-Sectional Area - 3.5 in2 at the runner entry tapered to 2.9 in2 at the flange exit ?

Port Size- 3.28 inch Height x 1.10 inch Wide 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.

? A-B Height - 7.32 inch (0 carb flange angle) Technical Data: 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.

? Throttle Body Flange - Standard 4150 for up to 1-3/4 inch diameter throttle bores

Features and Benefits:

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

Details:

• Barrel Quantity: 4.0
• Basic Operating RPM Range: 3500-8000 RPM
• Cnc Ported: No
• Carburetor Flange: Square/4150
• Carburetor Quantity: 1.0
• Carburetor Studs Included: No
• Color: Black
• Construction: Cast
• Cylinder Head Port Shape: Cathedral
• Deck Height: 9.24 Inch
• EGR Port: No
• Engine: GM LS1/LS2/LS6
• Flange Style: 4150 Square Bore
• Front Maximum Height: 7.32 Inch
• Fuel Injectors Included: No
• Fuel Rail(s) Included: No
• Fuel System Type: EFI
• 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: Black
• Rear Maximum Height: 7.32 Inch
• Recommended Use: Forced Induction
• Removable Runners: No
• Removable Top/Lid: N
• 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
• Warranty: Manufacturer's Limited 90 Day Warranty

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.