AeroFlow=Bare Small Block Ford Windsor 289-351 203cc Aluminum Cylinder Heads

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* With 58cc Chamber (Pair) 2.13" x 1.28" Intake Port, 1.40" x 1.40" Exhaust Port Head SpecificationsMaterial: A356 AluminumChamber: 58ccIntake Port Volume: 205ccIntake Port Dimension: 2.13" x 1.28"Exhaust Port Volume: 71ccExhaust Port Dimension: 1.40" H x 1.40" WExhaust Port Location: Raised .250"Spark Plug Location: OEMIntake Valve Diameter: 2.08"Exhaust Valve Diameter: 1.60"Valve Stem Diameter: 8mmValve Spring Pocket I.D.: 1.64"Valve Guide Material: Manganese BronzeValve Guide O.D.: .490" (.56