Holley EFI - Holley LS EFI Manifold - 2x4 Dual Plane - Black GM LS1/LS2/LS6 300-121BK
Type: Intake Manifold | Fits: GM
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”
Specs:
- Basic Operating RPM Range: 1500-6500 RPM
- Brand: Holley EFI
- Carburetor Flange: Square/4150
- Category: Engine
- Color: Black
- Construction: Cast
- EGR Port: No
- Emission Code: 4
- Engine: GM LS1/LS2/LS6
- Finish: Black
- Flange Style: 4150 Square Bore
- Front Height: 4.47 inch
- 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 Height: 5.54 inch
- Rear Maximum Height: 5.54 IN
- Removable Runners: No
- RPM Power Band: 1500-6500 RPM
- Single Or Dual Plane Type: Dual Plane
- Sub Category: Cylinder Block Components
- Throttle Body Included: No
- Warranty: Limited 90 Day
Tech Resources:
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).
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Important Notices
- Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
