[72 Chevy Nova]

If my 350 sbc has 8.5 compression with 76 cc heads, what will my comp. be if I change to 67 or 64 cc heads? I know there is a formula to figure this out be for the life of me I can"t find it. Here is my current set up Napa rebuilt long block with 882 heads (been told these motors are bad about having less than advertised comp. ), Comp cams xe268h cam with matched springs, RPM manifold, 650 edelbrock carb, 1 5/8 long tubes, 2.5 pipes with balance pipe, TH 350 with shift kit stock converter in a 3300# 72 Nova with 3.08 gears. I now a new converter is needed, thinking 2500 stall any suggestions? and the gears going to be changed to 3.42. This is a daily driver that gets played with on the weekends. Thanks for the help.

 

[kuhn-77]

with 64cc chambers you're looking at 9.6:1 compression ratio
with 67cc chambers you're looking at 9.3:1 compression ratio

 

[kuhn-77]

here's a compression calculator

its the one i used to get your numbers

 

[72 Chevy Nova]

Thanks for the info and the link. Any ideas on what the current combo is making power wise and what it will raise to if I change to say World S/R Torquers or Vortecs? Which would be better?

 

[BigBlockBanjo]

IMHO....
I would get the S/R Torquers, in a 64cc chamber. A 62cc wouldn't hurt... :thumbup: Esp. since you have the 268 cam. Vortech, you'll have to get another intake; Do you like aluminum heads? I might be going out on a limb to say the World heads are a little better? I myself like Dart products....
My .02....