Building a forced induction or nitrous LS3 or L92 and need an intake that can keep up? Speed Engineering's single plane mid-rise intake manifold is cast and machined from aluminum with a 4150/4160 square bore carburetor flange and a broad 2500-7000 RPM power band — ideal for centrifugal blowers, turbochargers, or nitrous applications. Compatible with LS3, L92, and other Gen 4 rectangular port cylinder heads. Hardware and o-ring gaskets are included, along with a 3/8" vacuum port for accessory and boost reference connections.
⚠️ Important Compatibility Note: Factory fuel rails will NOT work with this manifold. The Speed Engineering billet fuel rail kit (26-1086) is required for installation.
Features:
- Single Plane Mid-Rise Design — Optimized for forced induction and high-RPM power
- Cast and Machined Aluminum Construction — Durable and precision-fit
- 4150/4160 Square Bore Carburetor Flange — Compatible with standard square bore carburetors and throttle bodies
- 2500-7000 RPM Power Band — Broad operating range for street and strip applications
- Ideal for Centrifugal Blowers, Turbochargers, or Nitrous — Engineered for forced induction and nitrous power adders
- 3/8" Vacuum Port — For boost reference, vacuum accessories, or brake booster connections
- Hardware and O-Ring Gaskets Included
- Compatible with LS3, L92, and Gen 4 Rectangular Port Cylinder Heads
Compatible Engines:
- LS3 6.2L — Gen 4 Rectangular Port
- L92 6.2L — Gen 4 Rectangular Port
- Other Gen 4 Rectangular Port LS Engines
Frequently Asked Questions:
Q: Will my factory fuel rails work with this manifold?
No. Factory fuel rails will not work with this manifold. The Speed Engineering billet fuel rail kit (26-1086) is required for proper installation.
Q: What cylinder heads is this manifold compatible with?
This manifold is compatible with LS3, L92, and other Gen 4 rectangular port cylinder heads.
Q: What carburetor or throttle body fits this manifold?
This manifold uses a 4150/4160 square bore flange, compatible with standard square bore carburetors and throttle body adapters.
Q: Is this manifold good for a forced induction build?
Yes. This single plane mid-rise design is specifically suited for centrifugal blowers, turbochargers, and nitrous applications, with a broad 2500-7000 RPM power band.
Q: Is hardware included?
Yes. Hardware and o-ring gaskets are included with the manifold.
Q: What is the vacuum port size?
This manifold has a 3/8" vacuum port for boost reference, vacuum accessories, or brake booster connections.
Q: Is this manifold street legal?
No. This is a race-only product intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).