This is topic THERMACTOR (smog port) PLUGS...?? in forum Tech Talk at Northern California Ford Owners .
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Posted by 8850GT (Member # 5909) on
:
got some edelbrock performers #60329...need to block the smog ports on the back of the head....anyone know off hand what size plug or bolt to buy?? already tried 5/8's fine...didnt work....
Posted by Hozr (Member # 6196) on
:
I think they are 5/8 - 11 which is coarse thread I'll look when I get home I might have some lying around.
A
Posted by 89saleen (Member # 3083) on
:
I think I screwed in a sparkplug and snapped off the top.
Posted by 8850GT (Member # 5909) on
:
it ended up being like a 9/16 coarse....got a bolt with some silicone on it...ALL DONE!
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