I don't really know my way under the hood that well, Can some one tell me or better yet post a pic of where the PCV valve on a 99 silverado is? I wanna run some seafoam through it but don't know where it's located.

 

If its anything like my truck at all [1998 K2500 7.4] it should be on your right valve cover with a hose coming out of it, straight into the intake manifold. What size is your motor?

 

I have the 5.3L V-8

 

Linkage

Thats a link to another thread here on CF concerning the same thing.

And it appears I'm correct; it should be on your right valve cover with a vacuum line coming off of it into the intake.

 

Thanks you very much!!!