Chevy 420

Cylinder Bore Size

• 4.000 in - 101.52 mm (6)
• 4.030 in - 102.28 mm (6)
• 4.040 in - 102.54 mm (6)
• 4.060 in - 103.04 mm (6)
• 4.125 in - 104.69 mm (6)
• 4.155 in - 105.45 mm (6)
• 4.165 in - 105.71 mm (6)
• 4.186 in - 106.24 mm (6)

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With Rings \ Without Rings

• Includes Rings (24)
• Without Rings (24)

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Crankshaft Stroke

• 3.875 in (48)

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Connecting Rod Length

• 6.000 in (48)

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Piston Pin Diameter

• .927 (48)

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Compression Height

• 1.062 (48)

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Cylinder Head Type

• SBC 23 Degree (48)

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Piston Series

• 1 - FX Series (16)
• 2 - FX Series (16)
• 3 - FX Series (16)

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Piston Top Aprox. Comp. Ratio

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	10.07 to 1
  64cc	9.53 to 1
  70cc	9.05 to 1

  (6)

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	10.11 to 1
  64cc	9.57 to 1
  70cc	9.08 to 1

  (6)

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	10.21 to 1
  64cc	9.66 to 1
  70cc	9.17 to 1

  (6)

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	9.48 to 1
  64cc	8.97 to 1
  70cc	8.52 to 1

  (6)

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	9.58 to 1
  64cc	9.06 to 1
  70cc	8.61 to 1

  (6)

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	9.61 to 1
  64cc	9.1 to 1
  70cc	8.64 to 1

  (6)

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	9.69 to 1
  64cc	9.17 to 1
  70cc	8.71 to 1

  (6)

• -28cc Dish Top SBC 23 Degree

  Chamber	Comp Ratio
  58cc	9.95 to 1
  64cc	9.42 to 1
  70cc	8.94 to 1

  (6)

Show all Piston Top Aprox. Comp. Ratio