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Product Details
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Vehicle Compatibility
Select your vehicle to verify compatibility:
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Key Features
Holley Modular Ultra Lo-Ram EFI Manifold LS1/2/6
The 300-621 Ultra 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.
The Holley LS1/2/6 Ultra 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 Ultra 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.
The 300-621 Ultra 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.
The Holley LS1/2/6 Ultra 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 Ultra 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.
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Product Specifications
Basic Operating RPM Range
3500-8000
Basic Operating RPM Range
3500-8000 RPM
Brand
Holley EFI
Carburetor Flange
N/A
Carburetor Quantity
N/A
Carburetor Studs Included
N/A
CNC Ported
No
Color
Black
Construction
Cast
Cylinder Head Port Shape
Cathedral
Deck Height
9.24
EGR Port
No
Engine
GM LS1/LS2/LS6
Flange Style
EFI
Front Maximum Height
6.86" height with throttle body adapter
Fuel Injectors Included
No
Fuel Rail(s) Included
Yes
Fuel System Type
EFI
Gasket Or Seal Included
No
Grade Type
Performance
Injector Quantity
Single
Inlet Location
Front
Intake Port Gasket(s) Included
No
Manifold Type
Ultra Lo-Ram
Material
Aluminum
Nitrous Bung(s) Included
No
Part Type
Engine Intake Manifold
Plenum Finish
Black
Product Type
Intake Manifold
Recommended Use
Forced Induction
Removable Runners
No
Removable Top/Lid
Yes
RPM Power Band
3500-8000 RPM
Single Or Dual Plane Type
Single Plane
Throttle Body Bore Diameter
105 MM
Throttle Body Gasket Included
Yes
Throttle Body Included
No
Vacuum Ports
Yes
Warranty
Manufacturer's Limited 90 Day Warranty
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Package Contents
Kit includes all necessary components. Please refer to manufacturer specifications for detailed package contents.
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