Since I'm pulling the 440 out of the GTX this off-season,I'm seriously considering sending the Performer RPM's over to Dwayne to do a Stage II port and mill them to achieve a 11:1 compression. Current compression is 10:25. For anyone that's had this done...what is your combo,and how much difference did it make? More than a few knowledgable people have told me it would easily put me in the 10.80-10.90 range. My current BEST is a 11.19 @ 120mph. Heavy(3725 lbs. w/driver)and want to continue running pump swill! Thanks in advance for your info...and time! Randy B.