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6:1 High Compression Head Set Aluminum For Harley-Davidson Flathead 1939-1973
  • 6:1 compression cylinder heads for Harley-Davidson
  • Heads have a steel insert, cast in, to accept the 18mm spark plug
  • Combustion champer is 10.5mm deep
  • Fits:
    • G 1939-1973
    • WLD 1939-1946
    • W 1939-1952

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