Holley 300-621 LS Ultra Lo-Ram EFI Intake Manifold Kit

The Holley 300-621 LS Lo-Ram EFI Intake Manifold Kit is designed for GM LS-Series applications and features a cathedral-port configuration for multi-port fuel injection. Its Ultra Lo-Ram design provides a compact intake manifold format for builds where packaging and performance-focused component selection are important.

This intake manifold features a 105 mm throttle body flange and is constructed from aluminum with a natural finish. The kit includes fuel rails, providing key components for the fuel delivery side of the intake system. The manifold is intended for use with GM LS-Series engines using cathedral-port cylinder heads.

Use the Holley 300-621 as part of a compatible LS-Series EFI setup. Confirm engine configuration, cylinder-head port style, throttle body requirements and surrounding component clearance before installation to ensure proper application fit.

Features:

• Application: GM LS-Series engines
• Design: Ultra Lo-Ram intake manifold
• Port Configuration: Cathedral port
• Fuel System: Multi-port
• Throttle Body Flange: 105 mm
• Construction: Aluminum
• Finish: Natural
• Included Components: Fuel rails