Head work

[Mbryce42]

So I blew my headgasket for the second time in a couple years and am going to give it to my friend at a machine shop and he will do anything for free, but I dont know anything about head work and was wondering if someone has a link to a post or can tell me what I should get done, bigger valves? He said he'll shave and resurface it, but I was just wondering about specific measuremants or work besides that.    Thanks for any help