yes I have used them numerous times and referred others to them , you can have them do the head at the same time as the jug , send them the jug , be sure to remove the gasket off the bottom of the jug or they will charge you more as it can be a time consuming job , they bore the jug to the piston , there are 6 sizes for a 300 , they can do a sleeve but when it gets to that point unless you are going custom it is cheaper to just buy a jug then a sleeve job , but it the jug was obsolete it is a life saving deal , they send you back the piston and rings with all gaskets needed to do the job , takes about 2 weeks , for $20 more they will bead blast the jug or head , they use to charge $155 to do the head , I do that myself