im just wondering why you had it in 4 shops in the past year?that link to trinity,showed the pic of the top of the head,i hope your not thinking thats the bottom. best thing you can do is pop off the head make sure theres an oring where they lay into a small slot,there should be one on the bottom plate around the outside edge,two on the top plate around each spark plug hole,under each dome andaround the underside of each cylinder.that is if its machined the same way as a prodesign head.but the proof is in the pudding,youll find out if its there once you take it off.