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Holley 300-256 Single Plane Race Intake Manifold, LS1, LS2, LS6

-7%

#425300256

Holley 300-256 Single Plane Race Intake Manifold, LS1, LS2, LS6

Name: Holley 300-256 Single Plane Race Intake Manifold, LS1, LS2, LS6
Brand: Holley
SKU: 425300256
Price: 727.95 USD
Availability: InStock

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$727.95

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$787.95

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Product Summary

Single Plane Intake Manifold Type, Aluminum, Natural

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Key Specs

MFG. Part #	300-256
Brand	Holley
Intake Manifold Type	Single Plane
RPM Range	2,500-7,000
Material Type	Aluminum

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Holley 300-256 Details

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? Carburetor 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

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

Charts

Installation Instructions (PDF)

Guides & Documents

Intake Manifolds Installation Instructions (425300256)

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CARB warning

Holley 300-256 Specifications

KEY SPECS
MFG. Part #	300-256
Brand	Holley
Intake Manifold Type	Single Plane
RPM Range	2,500-7,000
Material Type	Aluminum

GENERAL
Carburetor Quantity	One
Finish	Natural
EGR	No
Cylinder Head Configuration	Cathedral Port
Intake Section Included	Complete
Overall Height	7.32"
Emission Code	3
Sold in Quantity	Each
GTIN Code	090127052341

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Fitment

2004-2005 Cadillac CTS

GM LS6

2006-2007 Cadillac CTS

GM LS2

1998-2002 Chevy Camaro

GM LS1

1997-2000 Chevy Corvette

GM LS1

2001-2004 Chevy Corvette

GM LS1
GM LS6

2005-2007 Chevy Corvette

GM LS2

2006-2009 Chevy Trailblazer

GM LS2

1998-2002 Pontiac Firebird

GM LS1

2004 Pontiac GTO

GM LS1

2005-2006 Pontiac GTO

GM LS2