Holley- 300-255 Single Plane EFI Split-Design Race Intake Manifold for LS1/2/6

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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 LS Race single-plane inta ke 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.  As-Cast Runner Cross-Sectional Area - 3.5 in² at the runner entry tapered to 2.9 in² at the flange exit  Throttle Body Flange - Standard 4150 for up to 1-3/4" diameter throttle bores 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" (0° carb flange angle) 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. Technical Data:  Port Size- 3.28" Height x 1.10" Wide Features: Lighter than other split race intakes Captured O-ring seals at head ports and split Maximum performance race design with hood clearance consideration 33 to 50% the price of other split race intakes Billet Fuel Rails and rail mounting hardware included. 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 Barrels 4 Basic Operating RPM Range 3500-8000 RPM Brand Holley Carburetor Flange Square/4150 Carburetor Quantity 1 Carburetor Studs Included No Category Engine CNC Ported No Color Silver Construction Cast Cylinder Head Port Shape Cathedral Deck Height 9.24 IN EGR Port No Emission Code 3 Engine GM LS1/LS2/LS6 Flange Style 4150 Square Bore Front Maximum Height 7.32 IN 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 Part Type Engine Intake Manifold Plenum Finish Natural Product Type Intake Manifold Rear Maximum Height 7.32 IN Recommended Use Forced Induction Removable Runners No Removable Top/Lid No Single Or Dual Plane Type Single Plane Sub Category Cylinder Block Components 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 UPC 090127052310 Part Number 300-255 Show more