COMPATIBLE:
2004 - 2005 CADILLAC CTS-V (5.7L-LS6)
1998 - 2002 CHEVROLET CAMARO (5.7L-LS1)
1997 - 2004 CHEVROLET CORVETTE (5.7L-LS1)
2001 - 2004 CHEVROLET CORVETTE Z06 (5.7L-LS6)
2005 - 2008 CHEVROLET CORVETTE (6.0L-LS2)
1998 - 2002 PONTIAC FIREBIRD (5.7L-LS1)
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 manifolds will work with OE or aftermarket cylinder heads. 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. The 300-621 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.
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Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads
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Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
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With forced-induction and the short runner length the engine rpm at which peak power occurs is more likely to be coupled to the supercharger or turbocharger being used
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Modular design allowing the use of front-feed plenum entry
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Intake design facilitates custom inlet duct and throttle body placement
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Low height to fit under a stock or mildly modified hood in the front configuration
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Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations
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Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
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High volume fuel rails and mounting hardware included with ¾”-16 o-ring ports (8 AN)
Basic Operating RPM Range |
3500-8000 RPM |
|---|---|
Brand |
Holley EFI |
Category Filter |
Intake Manifolds |
Clearance Category |
Intake Manifolds |
Color |
Silver |
Construction |
Cast |
EGR Port |
No |
Emission Code |
3 |
Engine |
GM LS1/LS2/LS6 |
Finish |
Silver |
Flange Style |
EFI |
Front Height |
6.86" height with throttle body adapter |
Front Maximum Height |
6.86 IN |
Fuel System Type |
EFI |
Grade Type |
Performance |
Injector Quantity |
Single |
Inlet Location |
Front |
Intake Port Gasket(s) Included |
No |
Manifold Type |
Ultra Lo-Ram |
Material |
Aluminum |
Nitrous Bung(s) Included |
No |
Plenum Finish |
Natural |
Product Type |
Intake Manifold |
Recommended Use |
Forced Induction |
Removable Runners |
No |
RPM Power Band |
3500-8000 RPM |
Sale Category |
Air and Fuel Delivery |
Single Or Dual Plane Type |
Single Plane |
Throttle Body Bore Diameter |
105 MM |
Throttle Body Included |
No |
Warranty |
Limited 90 Day |
UPC |
090127077573 |
Part Number |
300-621 |
ABOUT HOLLEY PERFORMANCE
For over a century Holley has driven the cutting edge of fuel-system design. That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. Top brands like MSD, Flowmaster, Hurst, Accel, and many more make up the industry’s leading offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holley’s commitment to its customers and their cars is at the core of everything we do.
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