Home

Models, Books, and Shirts
Gifts For The Car Guy!
Share
Car Movies
Trans Am Parts
Car Television
FAQ
Links
Search Trans Am on Ebay
Magazines
About my '78 T/A
Books That I have Read
Rare Pontiacs
Tips & How To
Old Car Ads
Web Surfers Cars
Car Posters
Where to Buy/Sell your T/A
Gallery
Old Trader Ads
Other websites that I have created
Site map
My Photographs

 

 

 

 

 

 

 

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