CNC Port LS1 5.3, 5.7, and 6.0 Head to Stage 2 Available 3.900” (5.3 and 5.7), 4.000”, and 4.125” CNC Combustion Chambers (6.0) Competition Multi-Angle Valve Job Blend Valve Job Mill Heads to Customer Specs Flow Intake and Exhaust Ports Heads Cleaned, Set Spring Heights, Assemble, Seat Pressure, Installed Height, and Coil Bind Ferrea 2.020 Intake Valve Stock LS1 1.550 Exhaust Valve (REV 1.57” Exhaust Valves are also available) Standard TEA "Gold" 1.300" dual .650" lift springs, (Comp 1.250” 921 and Comp 1.440” 978 are also available) TEA Titanium Retainer TEA Locators GM Locks GM Intake and Exhaust Valve Seals