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I just recently replaced all my worn out valve springs with new ones and accidentally forgot to put in one of my valve spring shims. I've been driving it around for about a week now. Is it really that critical?? Could this harm my engine? :confused:
 

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wow, been there done that.
only way to tell if there is damage is to pull it out and check it.
no damage to mine, but we noticed it before the car was driven. car idled for about 20 mins then backed it out the drive way and the shim was sitting on the ground. we killed the engine and reinstalled it.
 

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On iron heads it's not so bad but on aluminum heads.....Ugg. You may have started chewing into the aluminum. Some springs are worse than others, especially those with higher spring pressures and flat wound dampers!!:eek:

As was said above, the only way to tell is to pull the spring and look.

Good luck...
 
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