Pontiac Compression Ratio Calculator

 

1967 through 71 Models

Enter the Pontiac Firebird VIN number in the spaces provided below.  Click the "Decode" button below for vehicle information.

 

PONTIAC 

Cylinder Over Bore:

  Inches

Stroke Length: 

  Inches

Head Chamber:

  CCs

Gasket Thickness:

  Inches

Deck Height:
Note: Neg. number above deck, Pos. number below deck

  Inches

Piston Dish: 

  CCs

Number of Cylinders: 

 

Stock and New Engine Displacement
and estimated Compression Ratio 

 

Stock

New Bore

GM Line :

   

  Inches

Series :

  C.I.D

 C.I.D.

Model/Engine :

  to 1

  to 1
Body Type :
Model Year :   cubic in.   cubic in.
Assembly Plant :   cubic in.    cubic in.
Sequential Production Number :    cubic in.   cubic in.
T.D.C. Volume:   cubic in.   cubic in.
Gasket Volume:   cubic in.   cubic in.
Deck Volume:   cubic in.   cubic in.
Pontiac Bore Stroke
265 3.75 3.00
287 3.75 3.25
301 4.00 3.00
316(317) 3.9375 3.25
326 3.718 3.75
'63 "326" 3.781 3.75
347 3.9375 3.5625
350 3.875 3.75
370 4.0625 3.5625
389 4.0625 3.75
400 4.12 3.75
421 4.09375 4.00
428 4.12 4.00
455 4.151 4.21

"Restoring Old Dreams"

Owner and Operator, Mr. David Mars
Serving the community since 1991
Email: david@texastransams.com
4588A Kennedale - New Hope Rd.
Fort Worth, TX  76140
Phone: 817-563-2121

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