302 smog removal
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Senior User
Joined: Jan 2008
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302 smog removal
i want to plug the holes off in the back of my heads what size bolt do i need to plug them off? the smog holes that is the engine is a 91 5.0 thunderbird engine going carbed in my 58 f-100
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
Just a very short bolt will be fine with no washer, possibly some black goo sealant. Usually there's a lot of carbon in the threads which seals them. You can also use 5/8 NC set screws.
If you can't start the screws you might need to borrow a tap to clean up the threads a little, even an old dull one will work okay for this.
If you can't start the screws you might need to borrow a tap to clean up the threads a little, even an old dull one will work okay for this.
