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Common Pontiac Displacements and Overbore Displacements.

400

  inches metric
bore 4.1212"  
stroke 3.75"  
overbore 0 0
disp/cyl 50.023 cid 819.72 cc's
displacement 400.18 6.557 litres
new bore size N/A  

400 bored .030 over

  inches metric
bore 4.1212"  
stroke 3.75"  
overbore 0.030  
disp/cyl 50.75 cid 824.43 cc's
displacement 406.03 6.595 litres
new bore size 4.1512"  

400 bored .060" over

  inches metric
bore 4.1212"  
stroke 3.75  
overbore 0.060  
disp/cyl 51.49 cid 829.15 cc's
displacement 411.92 cid 6.633 litres
new bore size 4.1812"  

Comments and Suggestions

Back to See other Engine Specs

© 1998-2010

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