How detectable is a bent valve?

Can it make my car run like crap?

Ok. My timing chain broke. And after thinking about it i just put on a new one? Started it up and it ran like crap!

So I decided to pull the head. I did and everything looks great. I konw for sure one valve took a hit. It's on the number 8 cylinder. The piston has a minor ding on it?

The only prob is the valve looks good. Just a little discolored where it took the ding.
Can this cause it to run so crapy????

 

it would probably smoke if it was bad, do you have it in time? did you line up the gears right?

 

if a valve hit a piston you need to replace it,,no reason to tear down the motor see a questionable cheap part and not replace it,,,send the heads to a good head shop and have them looked over

 

I guess that's what you get for not doing scheduled MX, you're lucky you didn't punch a hole in your piston... which you should replace anyway, if you heat it up with a ding in it it could come apart inside your block and do some serious damage. You could have a bent valve and not even notice just by looking and NO it would neccesarily smoke if it is bent. Did you line up all the timing marks before installing the chain or just throw it on and hope for the best?

 

have you done a compression test yet? if the valve isnt sealing then it would show up on a compression test. no need for more speculation. if the compression isnt good on all the cylinders it would tell you that your valve timing is probably off, if just on that cylinder than you're valve timing is probably fine and you need to replace that valve.

 

you should also check the pushrods if u havent already

 

he's got a 4.6