The 049™ cylinder head casting begins with a superior aluminum alloy with excellent machining characteristics, free of porosity, is weldable and has a hardness of 90-100 HB, thus the strength and stiffness is greatly improved over the average VW cylinder head. The aluminum alloy is processed through a high quality permanent mold. The end result is an excellent 049™ casting. From left to right: 44 X 37.5, 42 X 37.5 and 40 X 35.5, each with its own respective sized intake and exhaust runners. Click the more tab for additional information and pricing.