Holley 300-621BK Modular Lo-Ram EFI Manifold LS1/2/6, Front Feed

#425300621BK

Holley 300-621BK Modular Lo-Ram EFI Manifold LS1/2/6, Front Feed

Name: Holley 300-621BK Modular Lo-Ram EFI Manifold LS1/2/6, Front Feed
Brand: Holley
SKU: 425300621BK
Price: 1099.95 USD
Availability: InStock

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Product Summary

EFI Fuel System Type, Multi-port Injection Style, Black

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Key Specs

MFG. Part #	300-621BK
Injection Style	Multi-port
Intake Manifold Type	Lo-Ram
RPM Range	3,500-8,000
Material Type	Aluminum

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Holley 300-621BK Details

Lo-Ram Manifold Kit - LS1/2/6 Front-feed Black Finish

The Holley LS1/2/6 Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads. These intake manifolds will work with OE or aftermarket cylinder heads. The Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the 105 mm throttle body part number 112-581 or similar models. The base intake manifold is designed with a lower overall height to fit under a stock or mildly modified hood in the front-feed configuration.

The 300-621 Lo-Ram front-feed plenum entry was configured to provide a very low profile modular intake manifold suitable for turbocharged or centrifugally supercharged engines. The fuel rail kits come with two sets of brackets. A set for long (usually standard length) fuel injectors and a set for short (such as Pico, or LS7) fuel injectors.

Features:

Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads
Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
With forced-induction and the short runner length the engine rpm at which peak power occurs is more likely to be coupled to the supercharger or turbocharger being used
Modular design allowing the use of front-feed plenum entry
Intake design facilitates custom inlet duct and throttle body placement
Low height to fit under a stock or mildly modified hood in the front-feed configuration
Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations
Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
High volume fuel rails and mounting hardware included with ¾”-16 o-ring ports (8 AN)

Lo-Ram Base Intake Manifold Plenum Top Mounting Flange Height - 5.17"

Front Feed Plenum Configuration w/105mm Throttle Body Adapter - 6.86"

Lo-Ram Base Intake Manifold Plenum Top Mounting Flange Height - 5.17"

Front Feed Plenum Configuration w/105mm Throttle Body Adapter - 6.86"

Charts

Installation Instructions (PDF)

Guides & Documents

Intake Manifolds Installation Instructions (425300621BK)

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 300-621BK Specifications

KEY SPECS
MFG. Part #	300-621BK
Brand	Holley
Injection Style	Multi-port
Intake Manifold Type	Lo-Ram
RPM Range	3,500-8,000
Material Type	Aluminum

GENERAL
Fuel System Type	EFI
Color	Black
EGR	No
Cylinder Head Configuration	Cathedral Port
Throttle Body Bore Size	105mm
Intake Section Included	Complete
Plenum Material	Aluminum
Plenum Finish	Black
Base Finish	Black Powder Coated
Base Material	Aluminum
Throttle Body Included	No
Injectors Included	No
Aftermarket Fuel Rail Required	Yes
Fuel Rails Included	Yes
Runners Included	Yes
Runners Removable	No
Supplemental Bosses Cast-In	No
Supplemental Bosses Machined	No
Emission Code	3
Sold in Quantity	Kit
GTIN Code	090127079676

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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