Holley EFI- 300-621 Modular Ultra Lo-Ram EFI Manifold for LS1/6

Holley EFI

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Ultra Lo-Ram Manifold Kit - LS1/2/6

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.

Features:

  • Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads
  • Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
  • 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
  • Modular design allowing the use of front-feed plenum entry
  • Intake design facilitates custom inlet duct and throttle body placement
  • Low height to fit under a stock or mildly modified hood in the front configuration
  • Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations
  • Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
  • High volume fuel rails and mounting hardware included with ¾”-16 o-ring ports (8 AN)
Brand Holley EFI
Color Silver
Construction Cast
Emission Code 3
Engine GM LS1/LS2/LS6
Finish Silver
Flange Style EFI
Front Height 6.86" height with throttle body adapter
Fuel System Type EFI
Injector Quantity Single
Inlet Location Front
Manifold Type Ultra Lo-Ram
Product Type Intake Manifold
Recommended Use Forced Induction
RPM Power Band 3500-8000 RPM
Warranty Limited 90 Day
UPC 090127077573
Part Number 300-621

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