I am in the process of putting my motor back together and i was told the wrong way of putting the rockers back on and i had the car running for about 10 seconds of running like crap and i just noticed metal shavings on the top of my heads. what could this be from? am i screwed and how much could i get the whole motor rebuilt for if it would need it?

 

How did you put the rockers on? Make sure your answer is detailed.