I'm looking for a calculator that accepts .006, the ones I'm finding want it at .050. Do you have a source? Thanks.

 

Although it doesn't mention seat/advertised/.004/.006 duration, the results indicate it's using that value. You'll already need to know your static compression ratio for this form.
http://wallaceracing.com/dynamic-cr.php

Or this one where you need to know all the measurements.
https://www.jeepstrokers.com/forum/calculator/

 

Thanks much! I'll check it out. I have the static.

 

With that I get 8.63-1 dynamic, I like that better than the 10 something to one that I was getting using the @ .050.