I'm stumped....5.0 Stock Heads with Smog Plug Questions - FFCars.com : Factory Five Racing Discussion Forum

 
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post #1 of 19 (permalink) Old 04-20-2017, 03:02 AM Thread Starter
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I'm stumped....5.0 Stock Heads with Smog Plug Questions

I've tried to plug these holes, and I've purchased these smog plugs from LMR to fit the bill. But they're not threading in.

There is dirt inside the threads in the head, but I didn't think that that would cause the problem. If feels like the threads aren't even starting. Any tips or similar experiences?








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post #2 of 19 (permalink) Old 04-20-2017, 03:12 AM
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Tap

Dave,

Get the appropriate bottom tap for the holes and go from there . . .

If my single brain cell is working, I think it is a 5/8" hole (may be 1/2 inside"), it's been 40 years since I plugged those holes (mid to late 60's cars).
You can also plug these holes with a very short 5/8" bolt.

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post #3 of 19 (permalink) Old 04-20-2017, 03:35 AM
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They are indeed 5/8 x 11 threads. The dirt inside the heads is most likely carbon buildup. If you dont want to buy a tap, cutting slots in the threads of a bolt can work, but is a lot more time consuming.

The inside thread is 7/16 x 14.
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post #4 of 19 (permalink) Old 04-20-2017, 11:03 AM
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Quote:
Originally Posted by Derald Rice View Post
They are indeed 5/8 x 11 threads.

Yep

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post #5 of 19 (permalink) Old 04-20-2017, 11:47 AM
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I used the TFS Thermactor plugs in my TFS heads, but they are the same. My heads were new so I didn't have any thread issues but a few minutes with a plug or bottoming tap will clean things right up.

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post #6 of 19 (permalink) Old 04-20-2017, 12:02 PM
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post #7 of 19 (permalink) Old 04-20-2017, 12:05 PM Thread Starter
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Thank you for the replies

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post #8 of 19 (permalink) Old 04-20-2017, 02:38 PM
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The carbon buildup almost completely fills the threads. I used a wire brush for cleaning out a pipe in the holes. Then I was able to thread in a short bolt. I put some sealant on the bolt too.

Something like this from home depot will work:
Oatey 3/4 in. Heavy-Duty Fitting Brush-313282 - The Home Depot

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post #9 of 19 (permalink) Old 04-20-2017, 04:08 PM
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I just bought some bolts that fit, cleaned the threads as best I could and screwed 'em in with Red Loctite. 9 years on the road with no issues.

I'd have finished a long time ago if I knew they were this fun!


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post #10 of 19 (permalink) Old 04-20-2017, 05:33 PM Thread Starter
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Dan,
How the heck did you reach that top shelf?

I'll try Dan's steel brush idea tonight. If it doesn't work, I'll move on to the bottom tap.

Thanks Guys.
Dave






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post #11 of 19 (permalink) Old 04-20-2017, 06:44 PM
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I have used a small wire brush on a Dremel tool quite successfully on similar problems. If you do this make sure the brush is smaller than hole and keep a good grip on the Dremel.

HTH

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post #12 of 19 (permalink) Old 04-20-2017, 08:57 PM
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If you can get a Thread Chasing Set or get the specific one for your application, do so.

Too many are using taps, to clean up threaded holes, which actually cut some of the metal away. A Thread Chaser is not sharp like a tap but has flutes for debris to collect in such as a tap does but will not cut into the metal. It will remove the junk or clean up the threads just a bit.

Especially, when cleaning the threads in the block of an engine use a Thread Chaser and not a tap.

On another note: Sometimes a bottom tap is not always easy to come by, at least not at the local hardware store. I have taken a regular tap and ground off the end almost to the point where there is no more taper in the threads and it has worked fine as a bottom tap.

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post #13 of 19 (permalink) Old 04-20-2017, 09:04 PM
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Unless you are using the factory intake, there isn't a reason to plug them.
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post #14 of 19 (permalink) Old 04-20-2017, 09:36 PM
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Quote:
Originally Posted by rich grsc View Post
Unless you are using the factory intake, there isn't a reason to plug them.
Aren't they open to the exhaust port? Won't they leak exhaust gas, cause backfires etc. like a header leak? I don't know the answer, just asking.

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post #15 of 19 (permalink) Old 04-21-2017, 02:36 AM
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Quote:
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Aren't they open to the exhaust port? Won't they leak exhaust gas, cause backfires etc. like a header leak? I don't know the answer, just asking.

Sean
No, it is not open to the exhaust. It opens to the center of the crossover port on the intake manifold. Many aftermarket manifold don't even have the ports.
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post #16 of 19 (permalink) Old 04-21-2017, 02:44 AM
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I had blown air into them and it exited each exhaust port out of the thermactor bosses within

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post #17 of 19 (permalink) Old 04-21-2017, 04:09 AM Thread Starter
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I used the wire brush and after a half hour of twisting in the threads I finally got the plugs in. The second photo shows how much carbon came out. Thanks all.
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Last edited by DadofThree; 04-21-2017 at 10:16 AM.
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post #18 of 19 (permalink) Old 04-21-2017, 04:14 AM
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I thought the smog pump hooked up to these ports and pumped air into the exhaust ports.

It was confirmed by this LMR video at 38 seconds. Got to plug them up to avoid an exhaust leak.


George

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post #19 of 19 (permalink) Old 04-21-2017, 04:12 PM
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Exactly, why else would they have carbon buildup in them...

I'd have finished a long time ago if I knew they were this fun!


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