The Holley GM 2x4 dual plane manifold is designed in the tradition of the great dual Holley 4160 induction systems that competed on drag strips, in Trans-Am, and at Le Mans in the 1960s — now mated to the LS pushrod platform. Built for all GM LS Gen III or Gen IV engines with LS3/L92 style rectangular-port cylinder heads, its dual-plane, equal-distribution layout builds strong mid-range torque without giving up top-end power.
Specifications:
- Basic Operating RPM Range: 1500-6500
- Engine Application: GM LS3/L92
- Manifold Type: Dual Plane
- Flange Style: 4150 Square Bore
- Plenum Finish: Natural
- Construction: Cast Aluminum
- Fuel System Type: EFI
- Throttle Body Gasket Included: No
- Vacuum Ports: Yes
- Warranty: Manufacturer's Limited 90 Day Warranty
- Part Number: 300-134
The LS engine architecture does not use an intake-mounted water neck or distributor. The EFI version is designed for Bosch-style EV-1 or Magneti Marelli Pico fuel injectors — stock LS fuel injectors may not fit the fuel rail assembly properly.
FAQ
What engines does the 300-134 fit?
All GM LS Gen III or Gen IV engines equipped with LS3/L92 style rectangular-port cylinder heads.
What RPM range is this manifold built for?
The dual-plane layout is built for a 1,500-6,500 RPM power band.
Does this manifold work with stock LS fuel injectors?
No — the EFI version is designed for Bosch-style EV-1 or Magneti Marelli Pico injectors, which may not match stock LS fuel rail fitment.
What flange does this manifold use?
A 4150 square-bore flange.
