Did a search on them and came up with alot of smack talk but couldn't really find anyone who has run them. The reason im asking as im looking at a set of bare ones for really cheap. Thinking about cleaning them up and filling them with some half decent Comp Cams valves. Does anyone have any experience with these? Im more worried about durability than max performance. Figured to have about 700$ Cnd into the entire head swap. Was also looking into vortecs but the cheapest qoute i could get locally was 1050$ for a rebuilt set( typicaly oilfied rape and pilage tax).