any help with compression ratio

[benno440]

hi guys,
hopefully someone can help me with this.
i keep trying all these compression ratio calculators online and they all telling me 6.7:1, which cant be right.

specs are:
440 - 505
bore: 4.350
stroke: 4.25 (7.100 rod)
gasket bore and thickness: .40, 4.410"
flat top piston 4.5cc
80 cc heads.

i remember rusty a few weeks back telling me its just under 12.1 but i cant seem to get it to read that.

thanks guys

 

[Mick70RR]

11.95:1 if the deck height is zero.

http://www.wallaceracing.com/cr_test2.php

 

[67 B-body]

11.95:1 if the deck height is zero.

http://www.wallaceracing.com/cr_test2.php

X2......

Has your block been "0" decked?