The Holley GM LS3/L92 Hi-Ram intake manifold lower base is a cost-effective modular alternative to fabricated sheet-metal intakes for high-performance naturally aspirated and forced-induction applications where induction height isn't limited.
Specifications:
- Engine: GM LS3/L92
- Basic Operating RPM Range: 3,500-8,000
- Cylinder Head Port Shape: Rectangle
- Deck Height: 9.24"
- Fuel System Type: EFI
- Finish: Natural
- Construction: Cast Aluminum
- Type of Component: Lower Manifold
- Vacuum Ports: Yes
- Port Size: 2.49" H x 1.21" W
- Runner Length: 6.50" as-cast, tapered 4.25 to 2.77 in² cross-section
- Plenum Top Gasket Type: 3/32" round O-ring cord
- Mounting Flange Gasket Type: Round 3/32" O-Ring Viton, 3" I.D.
- Part Number: 300-214
Recommended for racing, performance, and street rod builds where hood restrictions aren't a factor. Plenum top must be ordered separately.
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
What engine platform is the 300-214 designed for?
GM LS3/L92 engines with rectangle-port cylinder heads.
Does this include the plenum top?
No, this is the lower manifold base only — a plenum top must be ordered separately.
What's the recommended RPM range?
3,500-8,000 RPM, suited to racing, performance, and street rod applications without hood height restrictions.
