I have a stock '99 shee, I want to mill the head down. How much can I take off of it? I am all of the sudden running hot, barfing out on the right pipe from the overflow tube. Could my antifreeze be bad? I topped it off with 60,000 mile Hyundai antifreeze after I changed the clutch cover o-ring. What is the wear limit for a top end compression wise? I am just under 120psi in both cylynders and how much variance can be between the two? Thanks for the help, i'm new here!