Engine - Cylinder Heads - V6 Cylinder Head CNC Machined

From GM Performance - These race-prepared aluminum heads are based on the familiar 18 degree Bow Tie V6/90 casting P/N 10134359. Their intake runners, combustion chambers and exhaust ports are already modified for maximum performance using CNC machinery. The 18 degree design offers improved airflow and more efficient combustion. The CNC cylinder head's port volumes and cross-sectional areas are configured for 4.5-liter (247ci) competition V6s with 4.100-inch and larger cylinder bores.