Engine - Cylinder Heads - Cast Iron Cylinder Head

From GM Performance - This high performance cast iron cylinder head is used on high output transverse mounted and fuel injected rear wheel drive V6/60 degree engines. It is machined for 1.72 inch diameter intake valves and 1.42 inch exhaust. (Standard heads have 1.60 inch intakes and 1.30 inch exhausts). this cylinder head is recommended for off road V6/60 degree racing engines.