Thanks so far guy's. But I thought early 460's like mine already have 7/16 studs. Can't I just bolt on a new set of studs and get rid of the bottle neck ones in there now and just bolt on the guides and rockers. I am not a huge motorhead so my knowlege is limited. My engine is aside from the bigger valves it has an edlelbrock performer cam and intake so you see it is not built to be a monster, Just a nice cruiser.