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I am trying to remove the smog system completely. I have searched the forum and maybe I am blind but cannot get the specific size of bolt that would be needed to plug the back of the heads where the crossover air pipe was. Any help would be appreciated.
 

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5/8 x1 coarse thread(95 5.8).
 

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5/8 - 11 coarse thread(95 5.8).
Fixed it for ya! ;)

There could be carbon build-up in there that will need to be cleaned out.

Another way to do it (if you don't care about the air tube) is to cut the ends off the tube and swap the fittings left to right on the heads.
 
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