Rebate
Rebate
|
#425300680BK
Holley 300-680BK LS3 Lo-Ram Manifold Kit, Single Injector, Black
- Designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads•
- Engineered for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
- Low height to fit under a stock or mildly modified hood in the front configuration
$921.95
/kit
Factory Shipped
$1,024.95
Save $103.00
Quantity
Need Help? Call to Order
Add to a list
Select an engine to verify Fitment
Select Engine
Product Summary
EFI Fuel System Type, Multi-port Injection Style, Black
- Designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads•
- Engineered for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
- Low height to fit under a stock or mildly modified hood in the front configuration
- Front entry plenum flange allows design and fabrication of special throttle body adapters or inlet ducts for custom installations
- Clears C6 Corvette cowls and hoods without modification
Rebates Available
See rebate detailsKey Specs
| MFG. Part # | 300-680BK |
| Brand | Holley |
| Intake Manifold Type | Lo-Ram |
| RPM Range | 3,500-8,000 |
| Material Type | Cast Aluminum |
Need To Know
Need help?
855.313.9176Quick and Easy Returns
Return PolicyHolley 300-680BK Details
Holley 300-680BK Details
Available with single or dual injector provisions and a burst panel flange, the LS3 Ultra Lo-Ram intake manifold is designed for boosted combinations with hood clearance in mind. The Holley LS3 Ultra Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads. These intake manifolds will work with OE or aftermarket cylinder heads. The Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application. The front plenum flange has a 105 mm opening to work with 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 in the front configuration. The LS3 Lo-Ram is constructed to provide a very low profile modular intake manifold suitable for fabrication of special throttle body adapters or inlet ducts for custom installations. Available with single or dual injector provisions and a burst panel flange options. 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.
Features:
- Designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads•
- Engineered for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
- Low height to fit under a stock or mildly modified hood in the front configuration
- Front entry plenum flange allows design and fabrication of special throttle body adapters or inlet ducts for custom installations
- Clears C6 Corvette cowls and hoods without modification
- Available with single or dual injector provisions and a burst panel flange.
- High volume fuel rails for eight and sixteen injector configurations. Mounting hardware included with 3/4-16 O-ring ports (8 AN)
- Billet options for the top and throttle body adapters are available seperately.
Charts
Instructions (PDF)
Rebates
Holley Fuel Up Spring Savings Event 2026

Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period has been extended and now runs from March 30, 2026 through April 19, 2026.
Guides & Documents
CARB Warning
For race/ off road use or for use on pre-1966 vehicles.
CARB Warning
For race/ off road use or for use on pre-1966 vehicles.
Holley 300-680BK Specifications
Holley 300-680BK Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 300-680BK |
| Brand | Holley |
| Intake Manifold Type | Lo-Ram |
| RPM Range | 3,500-8,000 |
| Material Type | Cast Aluminum |
| GENERAL | |
| Fuel System Type | EFI |
| Injection Style | Multi-port |
| Finish | Powder Coated |
| Color | Black |
| EGR | No |
| Cylinder Head Configuration | Rectangular Port |
| Throttle Body Bore Size | 105mm |
| Intake Section Included | Complete |
| Plenum Material | Aluminum |
| Plenum Finish | Powdercoated |
| Base Finish | Black Powder Coated |
| Base Material | Aluminum |
| Throttle Body Included | No |
| Injectors Included | No |
| Aftermarket Fuel Rail Required | Yes |
| Fuel Rails Included | Yes |
| Hardware Included | Yes |
| Overall Height | 6.86" |
| Runners Included | Yes |
| Runners Removable | No |
| Supplemental Bosses Cast-In | No |
| Supplemental Bosses Machined | No |
| Emission Code | 3 |
| Sold in Quantity | Each |
| GTIN Code | 090127100929 |
Ratings & Reviews
Ratings & Reviews
Fitment
Fitment
2012 Cadillac Escalade
6.2 Chevy LS V8
2007-2012 Cadillac Escalade ESV
6.2 Chevy LS V8
2007-2012 Cadillac Escalade EXT
6.2 Chevy LS V8
2007-2011 Chevy Avalanche
GM L76
2008 Chevy Tahoe
6.2 Chevy LS V8
2008-2009 Hummer H2
6.2 Chevy LS V8

