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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) while most aftermarket rings are 1/16 1/16 3/16. 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 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
No Image Available
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
No Image Available
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
No Image Available
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 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
No Image Available
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
