What is being sleeved is a banshee mono block that has a sleeve skirt broken so the entire sleeve needs to be replaced...they are boring out the entire sleeve and putting a new one in...that is what $170 gets you...then for $125 they will match the ports...it sounds like they will do all the decking and first bore to match the other but to be honest I did not ask those questions....but I will...thanks for the help on the details Jerry