Fact...after checking a LOT of these motors...after update compression will be from 95-110 lbs depending on altitude checked at, :faint: with the correct 08 high compression head 120-135. :becky: We have swapped heads around and the best thing you can do to raise compression is use the 08 head, it also has a much better combustion chamber. I also have done a leakdown test on a lot of these, the 95 psi motor had 3% leakage and thats about as good as it gets. Compression test does not tell you that much about motors condition as far as ring seal ect, get a proper leakdown test done and see what she seals at. 105 with 3-10% leak is good for a 09-10 motor.