im pretty sure the k20a3 is 9.8:1 so what about the k20a and the k20a2. i seen somewhere a k20a has 9.8:1 but thats the jdm one and that would have a higher compression like 11:1. right so how about the k20a2 in the type s and whats a k20c from? it has 11:1 too i guess? fill in the below...
k20a=jdm type r =?:1
k20c=?????????? =?:1
k20a2=us type s =?:1
k20a3=base rsx =9.8:1
thanks

 

K20A2 = 11:1

comp for K20A should be easy to find via search (cant remember exactly maybe 11.4:1)....

 

K20A = 11:5:1 ... I'm pretty sure it's that #.

EDIT: K20C? There is no such thing.