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CNC match ported cylinder heads feature increased flow and performance! D.S.S. starts with brand new Ford Racing PI long spark plug thread castings to ensure the highest quality and reliability. Heads are treated to a CNC machining process that increases intake flow over 20% & exhaust flow over 30% over stock! Sold in pairs and assembled with production springs, valves, retainers, locks, and seals. Camshaft, followers, and hydraulic lash adjusters are not included. Excellent upgrade for the 1999-04 Mustang GT & can be used on 1996-98 Mustang GT engines with additional modifications.