What size plugs for the smog holes on some 85 302 heads??? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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Old 03-14-2005, 10:05 PM   #1 (permalink)
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What size plugs for the smog holes on some 85 302 heads???

What size plugs can I use for the smog holes on a set of 85 heads.I am getting rid of the smog.Need help putting moyor in tommorrow eve.
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Old 03-14-2005, 10:06 PM   #2 (permalink)
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What size plugs for the smog holes on some 85 302 heads???

I meant I am putting motor in tommorrow eve.
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Old 03-14-2005, 10:08 PM   #3 (permalink)
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What size plugs for the smog holes on some 85 302 heads???

5/8-11 (coarse thread)
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Old 03-14-2005, 11:22 PM   #4 (permalink)
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What size plugs for the smog holes on some 85 302 heads???

I dont see no treads in the holes I think I need freeze plugs.
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Old 03-15-2005, 09:23 AM   #5 (permalink)
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What size plugs for the smog holes on some 85 302 heads???

If they are 302 smog heads...then the threads are there. Those same holes are normally used to attach "front dress" accessories to the engine, AC/PS/AIR Pump brackets, so it must be threaded. Ford makes a specific insert (usually have to buy them at the local Ford store parts department). The insert is meant to block the unused port...making the head useful on both left or right side.

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[ This Message was edited by: Beoweolf on 3/15/05 9:25pm ]
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Old 03-15-2005, 09:56 PM   #6 (permalink)
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What size plugs for the smog holes on some 85 302 heads???

Ford part number F4ZZ-6E086-A available at you Ford Dealer.
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