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Holley LS EFI Manifold - 2x4 Dual Plane - Black GM LS1/LS2/LS6

Holley EFI 2x4 Dual Plane Intake Manifold, LS Gen 3 LS1/LS2/LS6 engines, w/Black Ceramic Coating

Part # 300-121BK Be the first to write a review

Holley LS EFI Manifold - 2x4 Dual Plane - Black GM LS1/LS2/LS6

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Free Shipping - Lower 48 US States
MSRP $820.95
$655.95
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4

Emissions

This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street.

    See Emissions Details

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Holley EFI 2x4 Dual Plane Intake Manifold, LS Gen 3 LS1/LS2/LS6 engines

Features:

  • The Holley GM LS1/LS2/LS6 2x4V dual-plane was designed in the tradition of the great dual Holley 4160 induction systems that competed on drag strips, in Trans-Am and at Lemans in the 1960’s.
  • The dual-plane equal-distribution layout produces great mid-range torque without compromising top end power.
  • Carbureted and EFI versions available
  • Power band from 1500-7000 rpm
  • Appropriate for any street/performance, muscle car, or street rod enthusiast
  • Cast aluminum construction
  • Intended for use on all GM LS Gen III engines equipped with LS1/LS2 style cathedral port cylinder heads
  • Carb Flange Center-To-Center: 8-5/8”

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 Range1500-6500 RPM
Brand Holley EFI
Carburetor FlangeSquare/4150
CategoryEngine
ColorBlack
ConstructionCast
EGR PortNo
Emission Code4
EngineGM LS1/LS2/LS6
FinishBlack
Flange Style4150 Square Bore
Front Height4.47 inch
Front Maximum Height4.47 IN
Fuel Injectors IncludedNo
Fuel Rail(s) IncludedYes
Fuel System TypeEFI
Gasket Or Seal IncludedYes
Grade TypePerformance
Intake Port Gasket(s) IncludedNo
Manifold TypeDual Plane
MaterialAluminum
Nitrous Bung(s) IncludedNo
Part TypeEngine Intake Manifold
Plenum FinishBlack
Product TypeIntake Manifold
Rear Height5.54 inch
Rear Maximum Height5.54 IN
Removable RunnersNo
RPM Power Band1500-6500 RPM
Single Or Dual Plane TypeDual Plane
Sub CategoryCylinder Block Components
Throttle Body IncludedNo
WarrantyLimited 90 Day
UPC090127715857
Part Number300-121BK
4

This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street.

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Instructions - 199r10577rev3.pdf
All GM LS Gen 3 engines equipped with LS1/LS2 style cathedral port cylinder heads. NOTE: The EFI versions of the LS HI-Ram intake manifold and fuel rail are designed to accept Bosch Style EV-1 or Magneti Marelli Pico fuel injectors. OE LS fuel injectors may not fit properly in the Hi-Ram EFI intake manifold fuel rail assembly. There is a kit available separately for the LS7 Hi-Ram EFI to allow the use of stock LS7 fuel injectors, P/N 300-230 (see below in the service parts section).
Limited 90 Day: See Details

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