Product Description
Holley Ultra Lo-Ram EFI Intake Manifold Black LS1 LS2 LS6 Cathedral Port Front Feed
The Holley Ultra Lo-Ram EFI Intake Manifold is engineered for high-performance GM LS Gen III and Gen IV cathedral-port engines running turbocharged or supercharged combinations. Featuring a low-profile modular design, this intake is ideal for applications where hood clearance is critical while still providing the airflow needed to support serious horsepower.
The front-feed plenum allows for custom throttle body placement and inlet fabrication, making it an excellent choice for custom turbo and centrifugal supercharger builds. Designed around a 105mm throttle body, the Ultra Lo-Ram delivers outstanding airflow with peak power typically occurring in the 3,500-8,000 RPM operating range, depending on your engine combination.
Its compact design clears many factory engine bays, including 4th Gen Camaro and C5 Corvette applications, without requiring hood or cowl modifications.
High-volume fuel rails included, along with brackets for both standard-length and short (LS7 or Pico) fuel injectors, providing flexibility for a wide range of EFI builds.
Features
- Designed for GM LS Gen III & Gen IV engines equipped with LS1, LS2, and LS6 cathedral-port cylinder heads
- Optimized for turbocharged and supercharged engine combinations
- Low-profile design fits under many stock or mildly modified hoods
- Front-feed modular plenum allows custom throttle body and inlet duct fabrication
- Designed for use with a 105mm throttle body (Holley 112-581 or equivalent)
- Clears many 4th Gen Camaro and C5 Corvette hoods without modification
- High-volume aluminum fuel rails included
- Fuel rail kit includes brackets for both standard-length and short (LS7/Pico) fuel injectors
- 3/4”-16 O-ring (-8 AN) fuel rail ports
- Modular removable lid design for easy servicing and customization
- Durable black cast aluminum construction
Specifications
- Part Number: 300-621BK
- Basic Operating RPM Range: 3,500-8,000 RPM
- Engine: GM LS1 / LS2 / LS6
- Cylinder Head Port Shape: Cathedral
- Intake Manifold Type: Ultra Lo-Ram
- Intake Configuration: Single Plane
- Inlet Location: Front
- Throttle Body Bore: 105mm
- Front Height: 6.86”
- Deck Height: 9.24”
- Material: Cast Aluminum
- Finish: Black
- Fuel Rails Included: Yes
- Fuel Injectors Included: No
- Throttle Body Included: No
- Throttle Body Gasket Included: Yes
- Intake Gaskets Included: No
- Vacuum Ports: Yes
- EGR Port: No
- Nitrous Bungs: No
- Removable Runners: No
- Recommended Use: Forced Induction
- Removable Lid: Yes
Includes
- Holley Ultra Lo-Ram Intake Manifold
- High-volume fuel rails
- Fuel rail mounting hardware
- Standard-length injector brackets
- Short injector (LS7/Pico-style) brackets
- Throttle body gasket
Notes
- Fits GM LS Gen III and Gen IV engines equipped with LS1, LS2, or LS6 cathedral-port cylinder heads.
- Designed for use with a 105mm throttle body (sold separately).
- Fuel injectors, throttle body, intake gaskets, and sensors are not included.
- Intended primarily for turbocharged and supercharged applications.
