update on 350 Head Dilemma

[jostrans68]

First beware of what machine sho you use for your work. I now have been burned twice...about three years ago i sent in a set of heads to be done, good aet of 487x heads large valve etc....I bolted them on my motor recently and it rand about ten minutes then came a loud clang and clatter. So it turns out that I have a bent valve in two cylenders and when they warm up they bind. I tore it down today and found some other issues they did my posi seals but it appears according a new machine shop they used bad valves. so beware looks loke this head will go in again what is weird the other was done right....jack