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Old 04-30-2015, 09:05 AM   #1
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Exhaust leaks

I have a exhaust manifold leak on my 1998 chey damon, challanger motorhome, 454 engine, replaced the manifold with a new one and it leaks worse than the old one. was thinking of going to headers. Not sure what to do now. if anyone has a idea email at chasdobbs@rocketmail.com. thank you in advance.
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Old 04-30-2015, 09:55 AM   #2
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Did it leak right away or did it take a while? Manifolds need to be retorqued a couple of times, we usually do them at 200 miles and then again at 500.
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Old 04-30-2015, 10:10 AM   #3
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the leak started right away, tightened to 40 fp, let it run up to temp. retorqued and still leaked.
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Old 04-30-2015, 07:53 PM   #4
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Was it tested for being straight/warped? Was the old manifold straight, if not, have it planed at a local machine shop. It both manifolds are straight, test the head for being flat where the manifold fits. I've seen warped manifolds and warped or eroded (a long-term exhaust leak will erode an exhaust port) heads many years ago.
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