Holley 300-121BK LS EFI Manifold 2x4 Dual Plane Carb Manifold
Holley 300-121BK LS EFI Manifold 2x4 Dual Plane Carb Manifold
Holley

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#425300121BK

Holley 300-121BK LS EFI Manifold 2x4 Dual Plane Carb Manifold

  • The dual-plane equal-distribution layout produces great mid-range torque without compromising top end power.
  • Appropriate for any street/performance, muscle car, or street rod enthusiast
  • Intended for use on all GM LS Gen III engines equipped with LS1/LS2 style cathedral port cylinder heads
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$849.95

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Product Summary

  • The dual-plane equal-distribution layout produces great mid-range torque without compromising top end power.
  • Appropriate for any street/performance, muscle car, or street rod enthusiast
  • Intended for use on all GM LS Gen III engines equipped with LS1/LS2 style cathedral port cylinder heads
  • Power band from 1500-7000 rpm
  • Carbureted and EFI versions available
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Key Specs

MFG. Part #300-121BK
BrandHolley
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Holley 300-121BK Details

Holley EFI 2x4 Dual Plane Intake Manifold, LS Gen 3 LS1/LS2/LS6 engines
Features:
The dual-plane equal-distribution layout produces great mid-range torque without compromising top end power.
Appropriate for any street/performance, muscle car, or street rod enthusiast
Intended for use on all GM LS Gen III engines equipped with LS1/LS2 style cathedral port cylinder heads
Power band from 1500-7000 rpm
Carbureted and EFI versions available
Cast aluminum construction
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.
Carb Flange Center-To-Center: 8-5/8”

Specs

  • Basic Operating RPM Range: 1500-6500 RPM
  • Brand: Holley EFI
  • Carburetor Flange: Square/4150
  • Carburetor Quantity: 2
  • Carburetor Studs Included: No
  • Category: Engine
  • CNC Ported: No
  • Color: Black
  • Construction: Cast
  • Cylinder Head Port Shape: Cathedral
  • Deck Height: 9.24 IN
  • EGR Port: No
  • Emission Code: 4
  • Engine: GM LS1/LS2/LS6
  • Flange Style: 4150 Square Bore
  • Front Maximum Height: 4.47 IN
  • Fuel Injectors Included: No
  • Fuel Rail(s) Included: Yes
  • Fuel System Type: EFI
  • Gasket Or Seal Included: Yes
  • Grade Type: Performance
  • Intake Port Gasket(s) Included: No
  • Manifold Type: Dual Plane
  • Material: Aluminum
  • Nitrous Bung(s) Included: No
  • Part Type: Engine Intake Manifold
  • Plenum Finish: Black
  • Product Type: Intake Manifold
  • Rear Maximum Height: 5.54 IN
  • Removable Runners: No
  • Removable Top/Lid: No
  • Single Or Dual Plane Type: Dual Plane
  • Sub Category: Cylinder Block Components
  • Throttle Body Bore Diameter: 1.75 IN
  • Throttle Body Gasket Included: No
  • Throttle Body Included: No
  • Vacuum Ports: Yes
  • Warning: California Proposition 65
  • Warranty: Manufacturer's Limited 90 Day Warranty

CARB Warning

For race/ off road use only

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. 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 300-121BK Specifications

KEY SPECS
MFG. Part #300-121BK
BrandHolley
GENERAL
Sold in QuantityEach
GTIN Code090127715857

Questions & Answers

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Fitment

  • GM LM4

  • GM LS6

  • GM LS2

  • GM LSA

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM L9H

  • GM L94

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM L9H

  • GM L94

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM L9H

  • GM L76

  • GM LC9

  • GM LMG

  • GM LY5

  • GM LY5

  • GM LM7

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • GM LS1

  • GM LS3

  • GM LS1

  • GM LS1

  • GM LS6

  • GM LS2

  • GM LS3

  • GM LS4

  • GM LS4

  • 4.8 Chevy LS V8

  • GM LM7

  • 4.8 Chevy LS V8

  • GM L20

  • GM LM7

  • GM LY2

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ9

  • GM LQ4

  • GM L98

  • GM LM7

  • GM LQ4

  • GM L98

  • GM LQ9

  • GM L98

  • GM LQ4

  • GM L98

  • GM LQ4

  • GM LQ4

  • GM L98

  • GM L98

  • GM LQ4

  • GM LQ4

  • GM L98

  • GM LZ1

  • GM LS3

  • GM LM4

  • GM L77

  • GM LMG

  • GM LY5

  • GM LM7

  • GM L59

  • GM LM7

  • GM LC9

  • GM LMG

  • GM LY5

  • GM LC9

  • GM LMG

  • GM LMG

  • GM LY5

  • GM LQ4

  • GM L96

  • GM LMG

  • GM LY5

  • 4.8 Chevy LS V8

  • GM L59

  • GM LM7

  • 4.8 Chevy LS V8

  • GM LMG

  • GM LY5

  • 6.2 Chevy LS V8

  • GM L9H

  • GM LC9

  • GM LMG

  • GM LZ1

  • GM L9H

  • GM LC9

  • GM LMG

  • GM LZ1

  • GM LC9

  • GM LMG

  • GM LZ1

  • GM LMG

  • GM LY5

  • GM LH6

  • GM LS2

  • GM LM4

  • GM LM4

  • GM LM4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM L94

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM L94

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM L94

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM L94

  • GM LQ4

  • GM L20

  • GM L9H

  • GM LC9

  • GM LMG

  • GM LZ1

  • GM L33

  • GM L59

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM L96

  • GM LQ4

  • GM LQ4

  • GM L96

  • GM LQ4

  • GM L96

  • GM L96

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L20

  • GM LM7

  • GM LY2

  • 4.8 Chevy LS V8

  • GM L20

  • GM L94

  • GM LM7

  • GM LY2

  • GM LZ1

  • GM L94

  • GM LC9

  • GM LMG

  • GM LZ1

  • GM LM7

  • GM L59

  • GM LM7

  • GM LQ4

  • GM L96

  • GM LQ4

  • GM L96

  • GM LQ4

  • 6.2 Chevy LS V8

  • GM LH8

  • GM LH9

  • GM LH8

  • GM LH9

  • GM LS1

  • GM LS3

  • GM LS1

  • GM LS2

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