Ford 390

Cylinder Bore Size

• 4.050 in - 102.79 mm (6)
• 4.060 in - 103.04 mm (6)
• 4.080 in - 103.55 mm (6)
• 4.090 in - 103.80 mm (6)
• 4.110 in - 104.31 mm (6)

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With Rings \ Without Rings

• Includes Rings (15)
• Without Rings (15)

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Crankshaft Stroke

• 3.784 in (30)

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Connecting Rod Length

• 6.489 in (30)

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Piston Pin Diameter

• .975 (30)

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Compression Height

• 1.775 (30)

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Cylinder Head Type

• FE Ford (30)

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Piston Series

• 1 - FX Series (10)
• 2 - FX Series (10)
• 3 - FX Series (10)

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Piston Top Aprox. Comp. Ratio

• -5cc Flat Top FE Ford

  Chamber	Comp Ratio
  65cc	11.18 to 1
  72cc	10.35 to 1
  76cc	9.93 to 1

  (6)

• -5cc Flat Top FE Ford

  Chamber	Comp Ratio
  65cc	11.23 to 1
  72cc	10.39 to 1
  76cc	9.97 to 1

  (6)

• -5cc Flat Top FE Ford

  Chamber	Comp Ratio
  65cc	11.32 to 1
  72cc	10.48 to 1
  76cc	10.06 to 1

  (6)

• -5cc Flat Top FE Ford

  Chamber	Comp Ratio
  65cc	11.37 to 1
  72cc	10.52 to 1
  76cc	10.1 to 1

  (6)

• -5cc Flat Top FE Ford

  Chamber	Comp Ratio
  65cc	11.46 to 1
  72cc	10.61 to 1
  76cc	10.18 to 1

  (6)

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