This plenum base adapter is part of Holley's modular LS intake system, converting the LS1/LS2/LS6 cathedral port Mid-Rise dual-plane intake manifold base into a foundation for Holley's 92mm EFI plenum tops or other Hi-Ram plenum tops. It's built for street and performance street/strip applications with a powerband from 1,500-6,500 RPM, including blow-thru or turbocharged setups.
Specifications:
- Engine: GM LS1/LS2/LS6
- Material: Aluminum
- Finish: Black Ceramic Coating
- Type of Component: Manifold Top Adapter
- Product Type: Intake Manifold Conversion Kit
- Warranty: Manufacturer's Limited 90 Day Warranty
- Part Number: 300-267BK
Intended for GM LS Gen III or IV engines with LS1/LS2/LS6 cathedral port cylinder heads; OE ECU recalibration may be required. A Holley 558-416 adapter harness is available to adapt LS1/2-style MAP sensor harnesses to the LS3 MAP sensor recommended for this manifold.
FAQ
What does this adapter kit do?
It adapts Holley's LS1/LS2/LS6 Mid-Rise dual-plane intake manifold base to accept Holley's 92mm EFI plenum top or other Hi-Ram plenum tops for a custom EFI intake build.
What engines is it for?
GM LS Gen III or IV engines with LS1/LS2/LS6 cathedral port cylinder heads.
What RPM range is it designed for?
1,500-6,500 RPM, suitable for street, street/strip, or blow-thru/turbocharged applications.
Does it require ECU recalibration?
Recalibration of the OE ECU may be required when using this intake manifold design.
What MAP sensor does it need?
An LS3-style MAP sensor is recommended; Holley's 558-416 adapter harness can convert an LS1/2 MAP harness connection if needed.
