Depends really, mine sprayed some coolant into the overflow on the dyno at 7000rpm. We pulled it off the dyno and chucked ARP2000 studs in one by one the next day and it's been going for about 2 years since then. That's also running 550kw at the hubs and 2.1bar so not exactly friendly.
In terms of cams, if they have a recess you won't have to take them out, if they don't you will... It's not the hardest job, I'm no mechanic and it took me less than 4 hours