Holley Hi-Ram Lower Manifold – GM LS1/LS2/LS6

HOLLEY HI-RAM LOWER MANIFOLD – GM LS1/LS2/LS6

The HOLLEY HI-RAM LOWER MANIFOLD – GM LS1/LS2/LS6 is a cast aluminum intake manifold designed for high-performance naturally aspirated or forced induction GM LS engines in the 6.0 to 7.0+ liter range. It offers a cost-effective alternative to fabricated sheet-metal with modular compatibility for a variety of carbureted and EFI tops, making it ideal for drag racing, muscle cars, marine, off-road, and street-rod applications.

Key Features

• Port Size – 2.49” height x 1.21” wide
• Standard LS3 molded O-ring mounting flange gasket
• 3/32” round O-ring cord plenum top gasket
• 6.58” runner length with tapered runner cross-section (4.25 in² to 2.53 in²)
• EFI fuel rails machined for -8AN O-ring fittings to support high fuel flow and dampen pressure pulsations

Fitment

• GM LS1, LS2, LS6 engines
• Suitable for naturally aspirated and forced induction setups

Note: Verify compatibility with your specific engine build and fuel system requirements before ordering. This manifold is designed for high-RPM performance and may require tuning and supporting components for optimal results.