I have a 1970 350 block bored 60 over. 72 64cc heads.Pistons are dished the dish is aprox 20cc.standard felpro head gask.I cant find my tables on compr! I had to move, and cant find anything.If any one can give me a final compr.ratio I would apprecate it THANKS

 

To start with, your heads will be at least 68-70 cc's unless they have been cut .040".
Do not forget to add in gasket thickness, and piston deck height.
Having the wrong, or missing info will give you a wrong answer.
http://www.csgnetwork.com/compcalc.html
Jim

 

Best case scenario8.1:1.
More likely 7.8, just messaging the #'s without taking into account gap above the top ring. On the last meas, I used .030" in the hole, and a 20cc dish. Makes a big difference. Even cutting the heads .030" will only bring that # back up to 8.2:1 compression.
If you want more, you will need better pistons.
What is the distance the piston is in the hole, at TDC?
What are your goals, and what compression are you shooting for?
Here is a better calculator.
http://www.kb-silvolite.com/calc.php?action=comp
Jim