s14 ka's and last yr s13 ka's are 9.5:1

http://www.240edge.com/basics/ka24de.html

 

dont' go linking me some random ass website that knows nothing, and taking it as god.

 

I think my sources are a little better....
This link is Nissan's microfiche stating that all S13's built between 7/90 (first month for dohc) until the end of production had the same piston (part code 12010).
http://carfiche.com/fiche009/s13/2/f03.gif

Then you take one look at Nissan's factory service manual for a 1993 240sx, page EM-43 and it tells you plain as day that the compression ratio is 9.5:1.

 

^^ah ok you prove me wrong..good researching

 

i told you look up the part numbers.

make a sticky, look up part numbers, google, stfu.