Description
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.
This fits the 1991-1995 550SX aluminum reed engine bolt pattern and does not fit 440 550 cast iron piston port engines
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