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Milling Heads for a desired Compression Ratio

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Enter the required information into the boxes and click results!

Tip!

This Calculator is designed to tell you how much you need to mill your heads to achieve the 

specific Compression Ratio you are looking for. 
If you Do not know your current 

Compression Ratio, go to the Compression Ratio Calculator to figure it.  You will

need the actual compression of your setup now to complete this calculation.

 

Common Pontiac Numbers
Stroke CID

3.00

301

3.75

326

3.75

350

3.75

400

4.00

421

4.00

428

4.21

455

4.25

461

4.25

467

4.25

473

Current Compression Ratio:  

Desired Compression Ratio:

Stroke of Crankshaft:

Input your Compression Ratio and Desired Compression Ratio please





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