Holley EFI - Holley Hi-Ram Lower Manifold - GM LS1/LS2/LS6 300-227
Type: Intake Manifold Base | Fits: GM
The Holley GM LS1/LS2/LS6 Modular Hi-Ram Intake Manifold is introduced as an alternative to fabricated sheet-metal for high-performance applications where induction system height is not limited. Coupling this Hi-Ram intake with the high flowing LS1/LS2/LS6 style cylinder heads has outstanding potential for N/A and forced induction applications at a budget-minded cost. Aggressive, bold, race-bred styling will make bad intentions clear for drag race, muscle car, marine, off-road, sandrails, pulling trucks, track, street-rod applications and more.
• The base is designed to be modular in configuration to accept a wide range of carbureted and EFI tops and for builders and fabricators as the foundation for custom induction systems.
• Runner length and the tapered cross-section designed to perform well for a wide range of engine configurations
• EFI fuel rails are machined for -8AN O-ring fittings with passages large enough to accommodate high fuel flows and dampen pressure pulsations in the fuel system and come standard with EFI Hi-Ram kits
• Cast aluminum construction
• Intended for use on N/A or forced induction engines in the 6.0 to 7.0+ liter range with max power at 7000-8000+RPM
Features:
- Port Size - 2.49” H x 1.21” W
- Mounting Flange Gasket Type - Standard LS3 Molded O-ring
- Plenum Top Gasket Type - 3/32” Round O-ring Cord
- Runner Length - 6.58” As-Cast Runner Cross-Sectional Area - Tapered 4.25 in² to 2.53 in²
- Silver color
Specs:
- Basic Operating RPM Range: 3500-8000 RPM
- Brand: Holley EFI
- Category: Engine
- Color: Natural
- Construction: Cast
- EGR Port: No
- Emission Code: 4
- Engine: GM LS1/LS2/LS6
- Finish: Silver
- 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
- Material: Aluminum
- Nitrous Bung(s) Included: No
- Part Type: Engine Intake Manifold
- Plenum Finish: Natural
- Product Type: Intake Manifold Base
- Removable Runners: No
- RPM Power Band: 3500-8000 RPM
- Single Or Dual Plane Type: Single Plane
- Sub Category: Cylinder Block Components
- Throttle Body Included: No
- Type of Component: Lower Manifold
- Warranty: Limited 90 Day
Tech Resources:
These parts should be used for the following applications: Performance, Racing, and Street Rodder where hood restrictions are not a consideration.
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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.
