Air Injection Hole, Rethread it? |
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Air Injection Hole, Rethread it? |
BiG bOgGs |
Nov 8 2008, 12:14 PM
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#1
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The Bogus One Group: Members Posts: 452 Joined: 25-September 04 From: Ft. Myers, FL 33967 Member No.: 2,829 Region Association: South East States |
Hi Guys, I am dealing with a De-Smogged 76 that has some stripped threads in the holes in the heads. Two of the plugged holes are fine, but the other two slowly back/slide out, one of them pretty quickly. I was just wondering if I could re thread the holes just slightly larger. Two worries I have are... 1) would the larger diameter cause any problems with other parts of the head, and 2) would the little metal shavings that would come off into the head cause any possible problems or would they just eventually get blown out the exhaust?
Thanks, Jim |
Wilhelm |
Nov 8 2008, 02:34 PM
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#2
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Member Group: Members Posts: 408 Joined: 7-September 07 From: Hooterville, OR Member No.: 8,088 Region Association: None |
If you were going to put a plug in it you might consider a pipe tap as these form threaded holes that taper in at her bottom. This tends to wedge the plug in tighter as it goes in. If you want to use a conventional tap you'll like need to put a short bolt in the hole so the bottom of the bolt head can wedge against the hole. If you just screw a headless allen set screw into a straight tapped hole it will likely loosen up from the repeated heat cycles and if this happens exhaust may blow by the threads eroding things faster thus making the plug even looser.
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