Holley EFI Holley EFI Modular Lo-Ram Intake Manifold 300-621BK

Engine Intake Manifold


Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads.

Holley EFI Modular Lo-Ram Intake Manifold; Front Feed Cast Black; 6.86 in. Height w/Throttle Body Adapter; For Use w/GM/LS1/LS2/LS6;

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  • For Forced Induction Engines With Peak Power At 7000-8000 Rpm
  • Modular Design Allowing The Use Of Front-Feed Plenum Entry
  • Custom Inlet Duct And Throttle Body Placement
  • Fit Under A Stock Or Mildly Modified Hood In The Front-Feed
  • Clears 4Th Gen Camaro/C5 Corvette Cowls/Hoods w/o Modification
  • High Volume Fuel Rails And Mounting Hardware Included
The Holley LS1/2/6 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 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 low height to aid the packaging of a plenum mounted air-to-water intercooler in a top-feed configuration. The 300-620 top-feed plenum entry configuration is designed to allow the included Hi-Ram 105 mm plenum top to be fitted to a low-profile base intake manifold. The short runner, low-profile base intake manifold intended for forced induction applications was conceived to package with an air to water plenum mounted intercooler with a shorter overall height than possible with other existing intake manifolds. 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.


Engine Make/Size:GM LS1/LS2/LS6
RPM Range:7000-8000
WARNING CA Proposition 65:No


  • 300-621BK
  • 300-621BK
  • Holley EFI
  • New


Shipping Information

  • Item Requires Shipping
  • 28.4 lbs.
  • W14.1700” x H9.0600” x L24.8000”

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