Increasing your engines efficiency is a major way to improve performance and horsepower; the addition of performance-oriented aftermarket heads can greatly improve your engines output by enhancing airflow and combustion efficiency. ; Specifics and Features: ; LS3/L92 Cylinder Head Cylinder Head Material:Aluminum Cylinder Head Finish: Natural Combustion Chamber Volume (cc): 70 cc CNC-Machined Combustion Chamber: No Intake Runner Volume (cc): 260 cc Exhaust Runner Volume (cc): n/a CNC-Machined Intake Runner: No CNC-Machined Exhaust Runner: No Intake Port Shape: Rectangular Intake Port Location: Standard Exhaust Port Shape: Oval Exhaust Port Location: Standard ; Includes: 1 X Cylinder Head