L36/L26 are 9.4:1 and the L67/L32 are 8.5:1. Compression is determined by rod length and piston thickness.

I think this thread will have a lot of the info you're looking for on 3800s. 02BlueGT did a great job putting it together.

http://www.grandprixforums.net/f17/t...lots-7763.html