Rings

Engine Components- Internal - Rings
Butler Performance has the rings for your Pontiacs. Stock rings came in a thickness of 5/64 5/64 3/16 (455- 5/64 1/16 3/16) mostly made of iron, while most aftermarket rings are thinner 1/16 1/16 3/16. These thinner, modern rings help reduce friction which leads to reduced cylinder wall wear leading to longer engine life. Drop in rings must be ring gapped appropriately. They may need files slightly to set a proper gap. File fit rings come with .005" extra material for filing to set proper ring gap. For street engines we recommend .016-.018 ring gap. Proper ring gap is crucial to the expansion and contraction of the rings due to heat.

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326 Block
326 CU. IN. 3.750 Stroke 3.00 Main Journal Stock Bore 3.720 30 over 3.750 60 over 3.780 Factory Ring Thickness 5/64 5/64 3/16 Aftermarket Ring Thickness 1/16 1/16 3/16
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350 Block
350 CU. IN. 3.750 Stroke 3.00 Main Journal Stock Bore 3.875 30 over 3.905 60 over 3.935 Factory Ring Thickness 5/64 5/64 3/16 Aftermarket Ring Thickness 1/16 1/16 3/16
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389 Block
389 CU. IN. 3.750 Stroke 3.00 Main Journal Stock Bore 4.062 30 over 4.092 60 over 4.122 Factory Ring Thickness 5/64 5/64 3/16 Aftermarket Ring Thickness 1/16 1/16 3/16
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400/428 Blocks
400 CU. IN. 3.750 Stroke 3.00 Main Journal 428 CU. IN. 4.000 Stroke 3.25 Main Journal Stock Bore 4.120 30 over 4.150 60 over 4.180 Factory Ring Thickness 5/64...More Details »
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421 Block
421 CU. IN. 4.00 Stroke 3.25 Main Journal Stock Bore 4.093 30 over 4.123 60 over 4.153 Factory Ring Thickness 5/64 5/64 3/16 Aftermarket Ring Thickness 1/16 1/16 3/16
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455 Block
455 CU. IN. 4.210 Stroke 3.25 Main Journal Stock Bore 4.151 30 over 4.181 60 over 4.211 Factory Ring Thickness 5/64 1/16 3/16 Aftermarket Ring Thickness 1/16 1/16 3/16
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Aftermarket Block

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CLASSIC RACE (CR)

FEATURE BENEFITS:
Conventional Ring Set
High Performance Street Applications

  • Classic race sets in most popular bore sizes feature Ductile plasma moly top rings, conventional reverse torsional taper face 2nd rings and flex vent style 3 piece oil rings available is standard, low and light tension for most popular bore sizes. These are generally available in size to fit or drop in sets depending on your bore size.

ADVANCED PROFILING STEEL RINGS (CS)

FEATURE BENEFITS:
  • Manufactured from 440B stainless steel
  • Stronger, Longer life and Most Precise Tolerances
  • Thinner, Flatter and Lighter
  • Conforms Better to the Cylinder Wall
  • 1.0mm and larger available any bore size 2.992"-5.125"
  • Special axial sizing upon request
  • Works well in all applications, notably dirt environments
  • Easier on cylinders, reducing bore wear
  • Uses C33 face coating: doesn't allows dirt to penetrate coating
  • Available in Gapless or Conventional

GAPLESS RINGS (M)

FEATURE BENEFITS:
Increased horsepower and torque

  • Longer engine life
  • Saves money (fewer teardowns)
  • Improved consistency
  • Cleaner, cooler engine
  • Longer ring life
  • Better oil control
  • Less Friction
  • Increased intake signal
  • Wider torque curve
  • More engine vacuum