Package includes: Disassembly and cleaning of castings. Fully Cnc port intake, exhaust, and Combustion chamber,along with competition valve job. Flow intake and exhast ports (flow sheet included). New Ferrea 2.02 Intake valve, stock Ls-6 exhaust valve Assemble heads using dual gold .650"lift springs with titanium retainers,Gm locks and seals,with a spring cup. (other spring options are available) Check all spring heights and set pressures. Mill deck to customers desired combustion chamber volume. This head is an excellent upgrade for the guy who already owns a set of LS-6 castings and wants to make alot of power without purchasing aftermarket heads.