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

EFI single plane split-design race intake manifold. Fits all GM LS Gen III or IV engines equipped with LS1/LS2/LS6 style cathedral port cylinder heads

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" (0° carb flange angle)
• Port Size- 3.28" Height x 1.10" Wide
• Throttle Body Flange - Standard 4150 for up to 1-3/4" diameter throttle bores
• As-Cast Runner Cross-Sectional Area - 3.5 in² at the runner entry tapered to 2.9 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.

Specifications:

• Barrels: 4
• Brand: Holley
• Color: Silver
• Construction: Cast
• Emission Code: 3
• Engine: GM LS1/LS2/LS6
• Finish: Silver
• Flange Style: 4150 Square Bore
• Front Height: 7.32"
• Fuel System Type: EFI
• Manifold Type: Split Single Plane
• Product Type: Intake Manifold
• Rear Height: 7.32"
• Recommended Use: Forced Induction
• RPM Power Band: 3500-8000 RPM
• Warranty: Limited 90 Day
• Part Number: 300-255

Emissions:

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) 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

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