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914World.com _ 914World Garage _ 75-76 Head question

Posted by: Teknon Feb 28 2009, 05:58 PM

What length do the plugs have to be to cap off the emission holes.

Where does the hole go?

How does one efficiently seal these off?

????Joe

Posted by: r_towle Feb 28 2009, 06:10 PM

1---cant remember exactly..about 2-3 inches long.
2---into the exhaust port to inject air and dilute the exhaust
3---- with a bolt..that is all I have seen aside from new heads, or welding up the hole.

Rich

Posted by: markb Feb 28 2009, 07:08 PM

sww914 did this to my 76 2.0 motor just this week. Ask him over on Narp. He put in plugs.

Posted by: solex Feb 28 2009, 07:11 PM

I had mine welded shut. The PO had put caps on the tubes but they pulled out of the head....

Posted by: euro911 Feb 28 2009, 07:14 PM

My '75 heads had some Allen head slugs (installed by a PO). They were only about an inch long and they took a long Allen wrench to reach them. Make sure they go in nice and tight (maybe even use a dab of blue or red loctite on the threads) ... I had one of them completely back out

Posted by: sww914 Feb 28 2009, 07:15 PM

On Mark B's motor the threads were partially stripped on one or more of the holes so I installed 1/8" brass pipe plugs with red loctite. The 1/8" pipe threads are almost exactly the same thread pitch as the air injection tube threads and the plugs are tapered so they'll get a grip on the damaged threads and still seal. It's good enough to plug something that you don't ever want to use again.

Posted by: Krieger914 Feb 28 2009, 10:45 PM

I plugged mine a long time ago, but I believe they are the same plugs that a 911 would use. They are allen head. I got mine from Automotion. So maybe Performance Products has them.

Posted by: Teknon Mar 1 2009, 11:12 AM

Well looking that over, I looked up through the exhaust port and saw where it comes into the head. Thinking the smoother the better on the exhaust side, that can't be very good. On the other hand maybe those holes can power a small turbo Better yet a pre-heater for something.

Any way thanks for queuing in and helping out

Posted by: al weidman Mar 1 2009, 09:36 PM

sww 914 is right on for the simple fix. Those are 10mm fine threads and mine were mostly stripped. The pipe plug worked great and they are easy to get and install. I even used liquid steel when I put them in. Al.

Posted by: Drums66 Mar 2 2009, 12:36 PM

I installed 1/8" brass pipe plugs with red loctite. The 1/8" pipe threads are almost exactly the same thread pitch as the air injection tube threads and the plugs are tapered so they'll get a grip on the damaged threads and still seal. It's good enough to plug something that you don't ever want to use again.
[/quote]

I do/did what he said!.................although my threads were
not damaged in any way........no problems yet.