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Old 03-13-2012, 11:10 AM
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Threaded Plug size

I am trying to find some threaded plugs for my 351 Windsor heads. They are on the ends and appear to be about 5/8" in diameter but I can't seem to find any at the shops around here. Can anyone tell me the actual size of these plugs and where i can find some . Thanks
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Old 03-13-2012, 11:49 AM
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Quote:
Originally Posted by LBL
I am trying to find some threaded plugs for my 351 Windsor heads. They are on the ends and appear to be about 5/8" in diameter but I can't seem to find any at the shops around here. Can anyone tell me the actual size of these plugs and where i can find some . Thanks
If you are talking about the two, one above the other at about 45 degrees, top one is a 3/8 NC bolt and the other, outer is 7/16 NC bolt. They are on both ends of most SB Ford heads and are for the various brackets. If it's something else, give us a photo. These are my GT40P heads and you will see the two bolt holes surrounded by the messy at photo time wires:

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Old 03-13-2012, 12:08 PM
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Are They

into the water jacket? I don't really need them for anything at this time but thought they looked like they were into the water jacket and I should plug them if I'm not using them .
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Old 03-13-2012, 12:46 PM
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If they are the bolt holes I tried to show you with the photo, no, they do not go into the water jacket.
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Old 03-13-2012, 01:02 PM
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I think the OP means the smog pump holes on the back of the head. Found this on the Mustang site:


Leakproof
All Ford small-block heads since the 1975 are configured to accept smog-pump input into a hole in the back of the right cylinder head that is plumbed to the exhaust ports. The hole is drilled and tapped in both heads for a 5/8-inch national coarse (N.C.) thread. Ford inserts an adapter plug that is internally drilled and tapped for a 3/8-inch N.C. thread for the opposite end of the head in the front to mount the accessory-drive bracket. When an engine is rebuilt and bolted into an emissions-exempt vehicle, the rear hole may be left unplugged. Left open, the holes will generate a tremendous exhaust leak that may not be immediately apparent and could be blamed on leaky header gaskets. If the smog pump is not used, the O.E.M. Ford 5/8-inch blind hole insert (Ford PN 351418-S) is a simple and inexpensive fix to this problem.
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Old 03-13-2012, 01:19 PM
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Thanks

I will find some appropriate plugs and seal them up..
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