Flo-Tek LS3-500 276cc Bare Aluminum Cylinder Head for GM LS-Series

The Flo-Tek LS3-500 is a bare aluminum cylinder head engineered for GM LS-series engines, delivering high-flow performance at a competitive value. Featuring as-cast high-flow intake runners, this head is designed to significantly outperform stock LS3 castings right out of the box.

Key Features:

• 276cc intake runner volume for maximum airflow
• 92cc exhaust runner for efficient scavenging
• 68cc combustion chamber for optimized compression
• 2.160 in. intake / 1.590 in. exhaust valve sizing
• Valve guide measures .565 in. O.D.
• 15-degree valve angle — matches stock LS3 geometry, no special pistons required
• Ports in the stock location — no special valvetrain parts or rocker arms needed
• Compatible with any LS block with a 4.000" bore or larger
• Lightweight aluminum construction
• Sold individually (bare, unassembled)

In back-to-back flow bench testing at .650" lift, the Flo-Tek LS3 head outflowed stock LS3 castings by 44 CFM, making it an excellent upgrade for street performance and racing builds. The stock-location ports mean installation is straightforward with your existing valvetrain hardware. Available in bare form for builders who want to select their own valves, springs, and hardware.