Holley LS Hi-Ram EFI Manifold 300-123
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LS1/LS2/LS6 Cathedral Port EFI for 1 x 105MM Throttle Body
The Holley GM LS1/LS2/LS6 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 LS1/LS2/LS6 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.
- Base Plenum Top Mounting Flange Height – 8.42” to the lifter valley cover flange on the engine block.
- Total Height with 92/105mm EFI Plenum Top – 12.32” to the lifter valley cover flange on the engine block.
- Runner Length – 6.58”, As-Cast Runner Cross-Sectional Area – Tapered 4.25 in² to 2.53 in²
- Throttle Body Flange Location, with 102mm EFI Plenum Top: Height – 8.42” (from engine block lifter valley cover flange), Longitudinal Location – 3.84” (forward from engine block front flange), Angle – 25 deg. (down from vertical)
- Plenum Top Gasket Type – 3/32” Round O-ring Cord
- Mounting Flange Gasket Type – Standard LS3 Molded O-Ring
- Port Size – 2.49” Height x 1.21” Wide
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