The Holley LS1/2/6 Ultra Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads. These intake manifold and rail kits will work with OE or aftermarket cylinder heads. The 300-604 is the plenum top in the 300-621BK complete kit. Offering this separately allows you to select your components individually as you build your system. The Ultra Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the 105 mm 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-feed configuration. The 300-621 Ultra Lo-Ram plenum entry was configured to provide a very low profile modular intake manifold suitable for turbocharged or centrifugally supercharged engines. 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.
Specifications:
| Description_DEF |
Engine Air Intake Housing |
| Description_DES |
Plenum top for Ultra Lo-Ram 300-621BK |
| Description_MKT |
The Holley LS1/2/6 Ultra Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads. These intake manifold and rail kits will work with OE or aftermarket cylinder heads. The 300-604 is the plenum top in the 300-621BK complete kit. Offering this separately allows you to select your components individually as you build your system. The Ultra Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the 105 mm 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-feed configuration. The 300-621 Ultra Lo-Ram plenum entry was configured to provide a very low profile modular intake manifold suitable for turbocharged or centrifugally supercharged engines. 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. |
| Description_EXT |
Holley EFI Lo-Ram Plenum; Cast Black; For Use w/PN[300-621BK]/GM LS1/LS2/LS3; |
| Description_FAB |
Individual plenum top for 300-621BK allows you to select your components individually as you build your intake system |
| Description_FAB |
Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads |
| Description_FAB |
Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application |
| Description_FAB |
Modular design allowing the use of the included front plenum entry |
| Description_FAB |
Intake design facilitates custom inlet duct and throttle body placement |
| Description_FAB |
Low height to fit under a stock or mildly modified hood. |
| Description_FAB |
Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations |
| Description_FAB |
Clears 1998-2002 (4th Gen) Camaro/Firebird and 1997-2004 (C5) Corvette cowls and hoods without modification |
| Description_FAB |
High volume fuel rails and mounting hardware included with ┬╛"-16 o-ring ports (8 AN) |
| Description_INV |
PLENUM TOP, LS1 LO-RAM, BLACK |
| Description_SHO |
Air Intake Plenum |
| Emission Code |
3 |
| Finish |
Black |
| Product Type |
Intake Manifold Top |
| Warranty |
Limited 90 Day |
| Color |
Black |
| Discount Percentage |
5-25% |
| Manifold Type |
Ultra Lo-Ram |
| WARNING CA Proposition 65 |
No |
| Brand |
Holley EFI |
| Construction |
Cast |
| Engine |
GM LS1/LS2/LS6 |
| Fuel System Type |
EFI |
| Recommended Use |
Forced Induction |
| Clearance Category |
Air and Fuel Delivery |
| Sale Category |
Air and Fuel Delivery |
| Length |
2.0000 |
| Width |
10.0000 |
| Height |
18.0000 |
| Weight |
4.0000 |
