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Holley Hi-Ram Lower Manifold - GM LS7 300-228

SKU: 300-228

Availability: In stock

Handling Time: 30 Days


Holley Hi-Ram Lower Manifold - GM LS7

LS7 Carbureted Base Only

The Holley GM LS7 Modular Hi"“Ram Intake Manifold is introduced as a cost effective alternative to fabricated sheet"“metal for high"“performance applications where induction system height is not limited. Coupling this Hi"“Ram intake with the high flowing LS7 style cylinder heads has outstanding potential for N/A and forced induction applications at a budget"“minded cost. Aggressive, bold, race"“bred styling will make bad intentions clear for drag race, muscle car, marine, off"“road, sandrails, pulling trucks, track, street"“rod applications and more!

The base is designed to be modular in configuration to accept a wide range of carbureted and EFI tops and to be attractive to builders and fabricators as the foundation for custom induction systems.

Runner length and the tapered cross"“section designed to perform well for a wide range of engine configurations

EFI fuel rails are machined for "“8AN O"“ring Fittings with passages large enough to accommodate high fuel flows and dampen pressure pulsations in the fuel system and come standard with EFI Hi"“Ram kits.

Cast aluminum construction.

Intended for use on N/A or forced induction engines in the 6.0 to 7.0+ liter range, max power at 7000"“8000+RPM.


  • Port Size "2.49" Height x 1.21" Wide
  • Mounting Flange Gasket Type "Standard LS3 Molded O-Ring
  • Plenum Top Gasket Type "3/32" Round O-ring Cord
  • Runner Length "6.29", As-Cast Runner Cross-Sectional Area "Tapered 4.67 in² to 2.84 in²

Installation Note:These parts should be used for the following applications: Racing/Performance/Street Rodder where hood restrictions are NOT a consideration.


  • Brand: Holley
  • Construction: Cast
  • Emission Code: 3
  • Engine: GM LS7
  • Fuel System Type: Carb
  • Product Type: Manifold
  • Type of Component: Lower Manifold
  • Warranty: Limited 90 Day