Thread: Exhaust Leaks at Header
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Old 11-03-2002, 06:36 PM
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Join Date: Sep 2002
Location: Hickory, NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
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If the headers leak immediately after installation, something is wrong--holes don't match, header flange/s is not straight, bolts are not tightened gradually . . . ? But if your engine runs without leaks for a while, the challenge is to keep them sealed.

First off, nothing will work if the header flange isn't good and flat. Check it with an accurate straightedge to make sure. As for RTV silicone, it works regardless of whether it's hi-temp or not. A Winston Cup engine builder friend of mine will second that. He tosses the gaskets and uses silicone sealer only. Another solution to preventing header leaks due to loosening bolts is to drill the bolt heads with a 1/16" drill and safety wire them. That will keep them from backing out. Both have worked for me.
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