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Ford Racing's CNC-ported Three-Valve head (PN M-6050-N3VPA) features a slightly larger 53cc combustion chamber (compared to 51). The CNC-cut intake ports are sized at 202 cc's and flow 272 cfm at 0.600 lift. The exhaust ports measure 73 cc and flow 272 cfm at the same amount of lift. They include valves and springs, but no lash adjusters.