This single-plane EFI LS intake manifold fits all GM LS Gen III or IV engines equipped with LS1/LS2/LS6 style cathedral-port cylinder heads. Its optimized runner layout and constant cross-sectional area produce a broad torque curve across a 2,500-7,000 RPM power band, making it a strong option for centrifugal blower, turbocharged, or nitrous power-adder applications.
Specifications:
- Basic Operating RPM Range: 2500-7000
- Engine Application: GM LS1/LS2/LS6
- Manifold Type: Single Plane
- Flange Style: 4150 Square Bore
- Plenum Finish: Natural
- Construction: Cast Aluminum
- Weight: 11.5 lbs.
- Port Size: 2.50\" height x 1.15\" wide
- Throttle Body Gasket Included: No
- Vacuum Ports: Yes
- Warranty: Manufacturer's Limited 90 Day Warranty
- Part Number: 300-137
Includes mounting bolts, washers, and Viton O-ring cylinder head mounting flange gaskets for an OEM-style seal. This kit does not work with factory fuel rails and requires Holley Fuel Rail Kit P/N 534-219.
FAQ
What engines does the 300-137 fit?
All GM LS Gen III or IV engines equipped with LS1/LS2/LS6 style cathedral-port cylinder heads.
Will this work with the factory fuel rails?
No — it requires Holley Fuel Rail Kit P/N 534-219.
What comes included with this manifold?
Mounting bolts, washers, and Viton O-ring cylinder head mounting flange gaskets for an OEM-style seal.
What RPM range is this manifold built for?
2,500-7,000 RPM.
