FEATURES: New manufactured after market unused gas cylinder head.
REINFORCED ribs throughout. Strengthened walls. Nickel added metallurgy. 
Thicker spring seats & roof. Steel rings inserted onto exhaust seats (3 angle).
Fully machined gasket surface. OEM specifications. Heads are complete with new valves and springs , they have been professionally assembled by our in house staff and are ready to bolt on right out of the box.