- 1. 4 threaded holes in block-what are they for? (score: 1)
- Author: BarrMark262@aol.com
- Date: Sat, 14 Feb 2004 21:19:45 EST
- Hi List: My 74B is running pretty well now thanks to all of you. However, there are four threaded holes (7/16 by 20 pitch) located just above the spark plugs but below the top of the block. When I sh
- /html/mgs/2004-02/msg00315.html (7,368 bytes)
- 2. Re: 4 threaded holes in block-what are they for? (score: 1)
- Author: Barney Gaylord <barneymg@MGAguru.com>
- Date: Sat, 14 Feb 2004 20:55:48 -0600
- These are air injection ports for emissions controlled vehicles 1968 and later. The small holes go directly into the exhaust ports, just above the valve heads. In the absence of the air injection pum
- /html/mgs/2004-02/msg00317.html (7,747 bytes)
- 3. Re: 4 threaded holes in block-what are they for? (score: 1)
- Author: Bill McLeod <wbmcleod@cox.net>
- Date: Sat, 14 Feb 2004 19:55:16 -0700
- Those are the holes for the air injection system, which is run by the air pump. If you are without those things, plug them, and watch your compression rise! Regards, Bill
- /html/mgs/2004-02/msg00318.html (7,804 bytes)
- 4. RE: 4 threaded holes in block-what are they for? (score: 1)
- Author: "James Nazarian" <jhn3@uakron.edu>
- Date: Sat, 14 Feb 2004 22:14:33 -0500
- Dennis, they are the fittings for the air rail. They go directly into the exhaust port on the heads. If you are emissions exempt then you should plug them. James Nazarian 71 MGBGT V8 71 MGB Tourer Hi
- /html/mgs/2004-02/msg00319.html (8,017 bytes)
- 5. Re: 4 threaded holes in block-what are they for? (score: 1)
- Author: "Paul M." <rowman22001@yahoo.com>
- Date: Sun, 15 Feb 2004 08:04:33 -0800 (PST)
- This is correct, but be a shade careful when you do this. Cranking the plugs down too deep into those holes can crack or otherwise damage the valve seat. None of my local hardware stores had short en
- /html/mgs/2004-02/msg00324.html (7,973 bytes)
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