408 Stroker Naturally Aspirated 600hp on 91oct

   This 408ci LS stroker engine package is built for enthusiasts looking for a high-performance naturally aspirated LS engine with strong street manners, aggressive power, and modern EFI control. Designed to run on 91 octane pump gas, this combination produces 600 horsepower while maintaining smooth drivability, stable idle quality, and excellent throttle response.

Fuel and ignition are controlled by a Holley Terminator X Max EFI system, delivering reliable cold starts, self-learning fuel correction, and consistent performance across different environments and elevations. A FAST LSXR 102mm intake manifold and Icon Motion Raceworks 102mm throttle body provide excellent airflow and crisp throttle response throughout the RPM range.

Built around a GM OEM iron 6.0L LS block stroked to 408 cubic inches, this engine uses forged internals and AFR 238cc aluminum LS3 cylinder heads for excellent airflow, strength, and durability. Combined with a proven valvetrain package and performance oiling system, this engine is designed for repeatable real-world performance and long-term reliability.

This is a purpose-built 600 HP LS 408 stroker crate engine designed for street performance, reliability, and consistent results.

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 Order to Build: Typical build time is 6–7 weeks, depending on availability. Customers are kept updated throughout the build process. 

• BLOCK: GM OEM 6.0L Iron Block (Bored & Stroked) 
• CONNECTING RODS: Forged 6.125" Connecting Rods
• PISTONS: Forged Dished Pistons 
• CYLINDER HEADS: LS3 AFR 238cc
• INTAKE MANIFOLD: Fast lsxr 102
• THEOTTLE BODY: Motion raceworks ICON 102mm DBC
• EFI SYSTEM: Holley Terminator X or X Max
• COIL PACKS: High Output LS Coil Packs (Black Finish) 
• VALVE-TRAIN: LS7 Hydraulic Roller Lifters, Trunnion-Upgrade Rockers, Chromoly 5/16” Pushrods (TSP) 
• OIL SYSTEM: Melling high performance oil pump
• OIL PAN: Holley GM LS Swap oil pan
• HEAD GASKETS: BTR MLS 
• FASTENERS: ARP

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When requesting a quote, you will fill out the configuration page below where you can select available options such as cosmetic finishes, accessory drive setups, and other customization requests. we do not offer transmitions at this time.

Once completed, submit your configuration, and a formal quote will be provided for your LS 408 Stroker engine build.

From there, your engine will enter the production queue and begin the build process.