How do I determine: Bent cam chain guides?

[tussey]

I'm wondering if I have bent cam chain guides? How would I check and what would be the symtoms?

as per this thread.
http://gstwins.com/gsboard/index.php?topic=29777.0

It was suggested I may have done this turnning the engine backwards. I did get confused and turn it the wrong way a couple of times (during a valve check), how likely is it to break something? I didn't hear anything snap or break. 

[rangerbrown]

i have turned mine backwards a lot,

valve check and chain ajust (without plugs in) and while checking the chain so.... i hope not, although that would explain the noises (taping coming down to idle after having it up to speed, when hot)