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Common Pontiac Displacements and Overbore Displacements.

455

  inches metric
bore 4.1522"  
stroke 4.21"  
overbore 0 0
disp/cyl 57 cid 934.178 cc's
displacement 456.06 7.473 liters
new bore size N/A  

455 bored .030 over

  inches metric
bore 4.1512"  
stroke 4.21"  
overbore 0.030  
disp/cyl 57.83 cid 939.5 cc's
displacement 462.67 7.52 liters
new bore size 4.1822"  

455 bored .060" over

  inches metric
bore 4.1512"  
stroke 4.21  
overbore 0.060  
disp/cyl 58.67 cid 944.84 cc's
displacement 469.33 cid 7.558 liters
new bore size 4.2122"  

Back to See other Engine Specs

© 1998-2009

78blackbird@thepontiactransampage.com
Feel free to drop me a note. * I am looking for some good articles for the third and fourth gen birds. If you have any that you would like to see on this site send them to me and I will post them on my site.     

  • The information in here is just an outline.
  • The author claims no responsibility for the info contained in these pages. 
  • If unsure of any tip or modification seek a professional for the job.
  • In some states this may violate pollution laws
  • Check with your state on the laws.
  • Not affiliated with Pontiac or General Motors