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Exhaust performance results

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Old May 6, 2021 | 01:55 PM
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Default Exhaust performance results

I have a 383 that was recently rebuilt and I noticed a ticking and what feels like a light miss at all points of acceleration. I attached a shop vac to the exhaust and checked for leaks and found many. My exhaust is leaking at the manifold and at the pipe on at least one side. Apparently I did a poor job with that part of the install.

So I'm going to replace those gaskets in the coming weeks. While I'm finding the time to do that, I'm curious to know if these leaks could be causing my performance issues. I know they could be the source of my tick (fingers crossed) but I'm not sure what else a leak can cause and was curious if anyone had any information. I would love to think that I just found the cause to all of my issues, but really won't be able to know that until I correct the problem. In the mean time, knowing that exhaust leaks COULD cause these problems will at least give me hope.

Thanks
Keith
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Old May 6, 2021 | 02:42 PM
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No.... miss will likely be due to..... timing.... weak spark.... bad sparkplug or wire.... or lean fuel-air ratio
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Old May 6, 2021 | 03:16 PM
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I was afraid of that, but had planned to pull the plugs and check wires while I'm under the hood.

Thank you,
Keith
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Old May 8, 2021 | 08:56 AM
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But great tip on using the shop vac, Maybe it’s so common that I should have already known, but I’d never thought of that...
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Old May 8, 2021 | 10:10 AM
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an exhaust leak can theoretically cause a miss if it leaks long enough to burn an exhaust valve. let's hope this is not the case. chrome bumper car. still q-jet carb and points? compression test too. a rebuilt engine can have a lifter set too tight causing lots of bad stuff...

Last edited by derekderek; May 8, 2021 at 10:11 AM.
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Old May 8, 2021 | 10:16 AM
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Not sure I would use a shop vac but I would use a mechanics stethoscope to pin point noise sources.
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