Holley 300-290BK GM LS-Series EFI Split Design Race Intake Manifold, Square Bore, Single Plane, Aluminum, Black Ceramic, Kit

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.

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.

Specifications:

• A-B Height - 7.20" (0° carb flange angle)
• Port Size- 2.59" Height x 1.28" Wide
• Throttle Body Flange - Standard 4150 for up to 1-3/4" diameter throttle bores
• As-Cast Runner Cross-Sectional Area - 4.5 in² at the runner entry tapered to 3.2 in² at the flange exit

Features:

• Maximum performance race design with hood clearance consideration
• Lighter than other split race intakes
• Split feature making porting efforts easy!
• 33 to 50% the price of other split race intakes
• 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
• Billet Fuel Rails and rail mounting hardware included.

Notes: 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.

Instructions

Instructions - 199R11472.pdf

Emissions Warning
Federal and State regulations may restrict Product installation to pre-regulation (Model Year 1974 or earlier), or “Competition,” or “Racing” Vehicles. Competition or Racing Vehicles may be operated exclusively in
1) events organized by recognized bodies, authorizing permits for participating drivers.
2) racing event qualification, and
3) practice associated with events.
Installation of such restricted Products in Model Year 1975 and later street driven Vehicles, including driving Competition or Racing Vehicles to the racetrack, is likely to be considered illegal “Tampering” or a “Defeat Device” subject to U.S. Federal and State penalties