TKM Performance 6 Bolt LS3 CNC Ported Cylinder Heads

TKM Performance 6 Bolt LS3 272cc 11 Degree Cylinder Heads set up for Boost Speier Racing Heads Designed CNC Ported 272cc Intake Runner and 112cc Exh Runner Exhaust O’Rings Drilled for Half Inch Head Bolt Holes Newen CNC Valve Job Heavy Duty SS 2.165 Intake Valves Inconel 1.600 Exhaust Valves .700 lift Capable Spring Kit with Ti Retainers Rocker Stands for Stock Rockers Included Assembled ready to Ship