Holley 300-621 LS Ultra Lo-Ram EFI Intake Manifold Kit 105mm Cathedral Port
Part # 300-621 SKU HLY300-621
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HOLLEY
Holley 300-621 LS Ultra Lo-Ram EFI Intake Manifold Kit 105mm Cathedral Port
Highlights
- Port style
- Cathedral Port
- Item length
- 20.5 in (52.07 cm)
- Position
- Engine Compartment
- Fuel type
- Gasoline
- Hardware/gaskets included
- Yes
- Engine size
- 350 in³ (GM LS-Series Cathedral Port Engines)
- Item height
- 6.86 in
- Manifold front height
- 6.86 in
- Item width
- 15.25 in (38.74 cm)
- Mounting style
- Bolt-On
- Removable top
- Yes (2-Piece Cast Aluminum)
- Injector bungs
- Yes (Multi-Port EFI)
- Operating range
- 3500 - 8000 RPM
- Color
- Natural (Silver)
- Cylinder head type
- Cathedral Port (LS Cathedral Heads)
- Material
- Aluminum
- Fuel rails included
- Yes
- Egr
- No
- Type
- Intake Manifold
- Throttle body flange diameter
- 105 mm (1 qty)
- Color/finish
- Natural
Description
Holley 300-621 LS Ultra Lo-Ram EFI Intake Manifold Kit 105mm Cathedral Port
The Holley 300-621 LS Ultra Lo-Ram EFI Intake Manifold Kit is engineered for high-performance applications where optimal airflow and power are essential. Designed specifically for use with LS engines, this manifold features a low-profile design that allows for increased hood clearance while maintaining an aggressive stance. By utilizing advanced engineering and materials, the Ultra Lo-Ram provides improved throttle response and greater horsepower capabilities, making it a must-have for serious automotive enthusiasts and race applications alike.
This manifold is crafted to accommodate 105mm throttle bodies, ensuring maximum airflow efficiency. Its cathedral port design optimizes airflow through the intake runners, improving the performance across the entire RPM range. With a focus on both performance and aesthetics, the Holley Ultra Lo-Ram is not only functional but also complements the engine bay's appearance with its sleek, durable finish.
The installation process has been simplified for mechanics and enthusiasts, featuring comprehensive hardware and clear instructions. Performance tuners will appreciate the manifold's compatibility with various fuel delivery systems, increasing versatility for different engine configurations. It's an ideal solution for both naturally aspirated and boosted applications, providing the flexibility needed in today’s competitive automotive landscape.
FITMENT: This intake manifold is specifically designed to fit LS series engines utilizing cathedral port cylinder heads, ensuring a precise fit and optimal performance without the need for extensive modification.
Key Features & Benefits
- Low-profile design for enhanced hood clearance
- Compatible with 105mm throttle bodies for superior airflow
- Optimized cathedral port design for improved power across RPM range
- Durable construction to withstand high-performance conditions
- Easy installation process with included hardware and instructions
- Versatile compatibility with various fuel systems for increased flexibility
Vehicle fitment
| Make | Model | Submodel | Years |
|---|
No vehicle matches that filter.
Fitment data from the manufacturer catalogue. Check your engine before ordering, or call us.
Specifications
| Identification | |
|---|---|
| Brand | HOLLEY |
| Part number | 300-621 |
| SKU | HLY300-621 |
| UPC | 090127077573 |
| Dimensions and weight | |
| Dimensions (W × H × D) | 15.00 × 21.00 × 15.00 in |
| Material and finish | |
| Color | Natural (Silver) |
| Material | Aluminum |
| Series and warranty | |
| Series | Modular Ultra Lo-Ram EFI |
| Details | |
| Includes | Intake Manifold, Fuel Rails, Gaskets, Hardware |
| Port style | Cathedral Port |
| Item length | 20.5 in (52.07 cm) |
| Position | Engine Compartment |
| Fuel type | Gasoline |
| Hardware/gaskets included | Yes |
| Engine size | 350 in³ (GM LS-Series Cathedral Port Engines) |
| Item height | 6.86 in |
| Manifold front height | 6.86 in |
| Item width | 15.25 in (38.74 cm) |
| Mounting style | Bolt-On |
| Removable top | Yes (2-Piece Cast Aluminum) |
| Injector bungs | Yes (Multi-Port EFI) |
| Operating range | 3500 - 8000 RPM |
| Cylinder head type | Cathedral Port (LS Cathedral Heads) |
| Fuel rails included | Yes |
| Egr | No |
| Type | Intake Manifold |
| Throttle body flange diameter | 105 mm (1 qty) |
| Color/finish | Natural |
Shipping and returns
Shipping. Free on every order, US only. Orders arrive in 2–4 days.
Returns. 30-day returns, except in extreme cases.
Support. Our team is available 24/7 for fitment mismatches or any other reason.
Warranty. Full manufacturer guarantee.
Not sure about this part? Ask us.
Fitment, install, what else you need for the job. A parts person answers, usually within one business day.
We answer by email. No account needed.
Questions and answers
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Reviews
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