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Holley EFI

Holley Modular Ultra Lo-Ram EFI Manifold LS1/2/6

Part # 300-621 Be the first to write a review

Ultra Lo-Ram Manifold Kit - LS1/2/6

Holley Modular Ultra Lo-Ram EFI Manifold LS1/2/6

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Advertised Price $1,049.95
$943.95
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3

Emissions

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

See Emissions Details

Made to match your build

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The 300-621 Lo-Ram 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.

Features:

  • Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
  • Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations
  • No burst panel, solid cast
  • Intake design facilitates custom inlet duct and throttle body placement
  • High volume fuel rails and mounting hardware included with ¾”-16 o-ring ports (8 AN)
  • 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
  • Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
  • Low height to fit under a stock or mildly modified hood in the front configuration
  • Modular design allowing the use of front-feed plenum entry
  • Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads

About Holley EFI

Find standalone EFI for LS, Coyote, Hemi and more at Holley.com. From engine swapping to managing up to 4000 horsepower, we have a solution for every project!

Basic Operating RPM Range3500-8000 RPM
Brand Holley EFI
Carburetor FlangeN/A
Carburetor QuantityN/A
Carburetor Studs IncludedN/A
CategoryEngine
CNC PortedNo
ColorSilver
ConstructionCast
Cylinder Head Port ShapeCathedral
Deck Height9.24 IN
EGR PortNo
Emission Code3
EngineGM LS1/LS2/LS6
Flange StyleEFI
Front Maximum Height6.86" height with throttle body adapter IN
Fuel Injectors IncludedNo
Fuel Rail(s) IncludedYes
Fuel System TypeEFI
Gasket Or Seal IncludedNo
Grade TypePerformance
Injector QuantitySingle
Inlet LocationFront
Intake Port Gasket(s) IncludedNo
Manifold TypeUltra Lo-Ram
MaterialAluminum
Nitrous Bung(s) IncludedNo
Part TypeEngine Intake Manifold
Plenum FinishNatural
Product TypeIntake Manifold
Recommended UseForced Induction
Removable RunnersNo
Removable Top/LidYes
Single Or Dual Plane TypeSingle Plane
Sub CategoryCylinder Block Components
Throttle Body Bore Diameter105 MM
Throttle Body Gasket IncludedYes
Throttle Body IncludedNo
Vacuum PortsYes
WarrantyManufacturer's Limited 90 Day Warranty
UPC090127077573
Part Number300-621
3

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
Instructions - 199r11813.pdf
Lo-Ram Base Intake Manifold Plenum Top Mounting Flange Height - 5.17" Front Feed Plenum Configuration w/105mm Throttle Body Adapter - 6.86"
Manufacturer's Limited 90 Day Warranty: See Details

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    *Free Shipping and Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.

    Holley Modular Ultra Lo-Ram EFI Manifold LS1/2/6
    Holley Modular Ultra Lo-Ram EFI Manifold LS1/2/6
    Advertised Price $1,049.95
    $943.95
    Save $106.00