Holley 300-290BK Single Plane EFI Split-Design Race Intake Manifold- GM LS3/L92- Black EFI Single Plane Split-Design Race Intake

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

Port Size- 2.59 inch Height x 1.28 inch Wide ? Throttle Body Flange - Standard 4150 for up to 1-3/4 inch diameter throttle bores Technical Data: 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. 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.

? A-B Height - 7.20 inch (0 carb flange angle)

Features and Benefits:

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

Associated Comments:

• Two different length fuel rail bracket sets are included; the long brackets are for mounting the fuel rails at a height for Bosch style EV1 type fuel injectors. The short brackets are for mounting the fuel rails at a height for GM OE LS7 fuel injectors.
• When using the OE GM LS7 injector, the O-ring on the outlet (intake manifold) end of the injector must be changed to the O-ring supplied in the short bracket pack.

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: Rectangle
• Deck Height: 9.24 Inch
• EGR Port: No
• Engine: GM LS3/L92
• 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: 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
• 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.