Posted by Don Williams [162.158.186.87] on Sunday, August 25, 2019 at 19:52:33 :
In Reply to: 318 intake manifold question posted by bucky [172.69.68.234] on Saturday, August 24, 2019 at 12:51:27 :
My '77-M886 has no plug in the place you reference. It is threaded, but no plug. Must be some application uses a plug. Perhaps engines with an EGR valve and catalytic converter? Just a guess.
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