LS3 276cc Cyl Head Assembled

The LS3 276cc Cylinder Head Assembled by FLOTEK is a precision-engineered casting designed for serious LS engine builders and high-performance enthusiasts seeking maximum flow capacity and durability. This fully assembled cylinder head represents a significant upgrade over stock LS platforms, offering the larger 276cc chamber volume that distinguishes the LS3 architecture from earlier LS1 variants. Whether you're building a crate motor for a street machine, track vehicle, or restomod project, this assembled head eliminates the guesswork of hand-selection and valve train assembly, delivering bolt-on confidence and proven reliability from the factory.

The 276cc combustion chamber volume is the defining characteristic that enables higher flow rates while maintaining efficient scavenging and optimal quench clearance for modern fuel octane ratings. FLOTEK's assembly process ensures consistent port-matching, proper valve seat concentricity, and factory-correct spring pressures that support aggressive cam profiles and high RPM operation. The casting accommodates both traditional hydraulic roller lifter configurations and modern direct injection variants, with precision-ported intake and exhaust runners that deliver measurable increases in volumetric efficiency across the mid to high RPM band—critical for applications ranging from 5,000 to 7,500 RPM peak torque windows. At 26 lbs per head, the weight is consistent with modern LS architecture, facilitating balance and installation in tight engine bays.

Builders upgrading from LS1 or earlier LS2 platforms will immediately recognize the flow advantages when paired with matching intake manifolds, camshaft profiles, and fuel system tuning. The LS3 276cc Cylinder Head Assembled is directly compatible with LS3 block cores, LS9 blocks, and many LS-based performance applications where factory or aftermarket cylinder head specifications call for this specific chamber size. Installation requires standard LS head gaskets, quality fasteners torqued to manufacturer specifications, and confirmation of deck height clearance—particularly important in stroker applications where increased piston travel demands careful valve-to-piston clearancing. Professional machine shops and DIY builders alike benefit from the complete assembly approach, reducing lead times and eliminating the risk of incomplete valve train components.