Flo-Tek LS3-505 276cc Assembled Cylinder Head for LS3 Engines

The Flo-Tek LS3-505 is a fully assembled replacement cylinder head designed for GM LS3 V8 engines. Featuring 276cc intake runner volume, this head is engineered to deliver strong airflow characteristics consistent with the LS3 platform's high-performance design. The assembled configuration means it arrives ready to install with valves, springs, retainers, and seals already in place, saving significant build time.

Key Features:

• 276cc intake runner volume for high-flow LS3-spec performance
• Fully assembled — valves, springs, retainers, and seals included
• Direct-fit replacement for GM LS3 V8 applications
• CNC-machined combustion chambers for consistent compression and efficient combustion
• Aluminum construction for reduced weight and excellent heat dissipation
• Hardened valve seats and guides for long-term durability

The Flo-Tek LS3-505 assembled cylinder head is an excellent choice for engine builders and performance enthusiasts looking for a cost-effective, ready-to-install LS3-platform head that meets OEM-equivalent or performance specifications straight out of the box.