Long duration cam in /6

805moparkid said
ok so stock is a 3.400 bore with lets has 54cc head and 0 deck (piston flat to deck surface) = 10.00 comp not actual numbers!!

and u bore it .100 over. so now is is 3.5" instead of 3.4. so u added volume but didn't make the squeeze any different. ur still compressing the same amount, but with more volume= less squeeze. make sense??

Using your numbers, and a .022 head gasket, with the 225 stroke of 4.125, the compression ratio is 11.52
Changing the bore to 3.500 the CR comes to 12.09

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

Increasing either the bore and/or stroke increases the CR. Decreasing the combustion chamber size and/or head gasket thickness, increases CR