The Holley GM LS1/LS2/LS6 Modular Hi-Ram Intake Manifold base offers an alternative to fabricated sheet metal for high-performance applications where induction height isn't limited. Paired with high-flowing LS1/LS2/LS6 cathedral-port cylinder heads, this black-finished base is built for naturally aspirated and forced induction engines from 6.0 to 7.0+ liters, with peak power at 7,000-8,000+ RPM.
Specifications:
- Engine: GM LS1/LS2/LS6, cathedral port
- Type: Intake manifold base only (lower manifold)
- Finish: Black
- Operating RPM Range: 3,500-8,000
- Construction: Cast aluminum
- Mounting Flange Gasket: Standard LS3 molded O-ring
- Runner Length: 6.58", as-cast
- Port Size: 2.49" H x 1.21" W
- Fuel Rails: Machined for -8AN O-ring fittings, included with EFI Hi-Ram kits
- Part Number: 300-227BK
Intended for performance, racing, and street rodder applications where hood restrictions are not a consideration.
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 300-227BK base designed for?
GM LS1/LS2/LS6 engines with cathedral-port cylinder heads.
What finish does this base have?
Black.
What RPM range is it built for?
3,500-8,000 RPM.
Is this part street legal?
No. It's legal for sale and use only on Racing Use Only vehicles that are never registered or operated on the street.
