All ADA Racing billet heads are made from 6061-T6 aluminum and CNC machined in-house for consistency and performance. The head shell is then anodized for durability and protection against salt-water corrosion.
This listing includes the head shell, O-rings that fit into the head shell grooves, and brass fittings.
Please Note: ADA Racing billet heads/domes use standard reach NGK ES spark plus (BR8ES or BR9ES) depending on compression. Higher compression requires colder spark plugs (BR9ES). This can also depend on ignition timing.