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| Headers with stock manifold https://www.slantsix.org/forum/viewtopic.php?t=63984 |
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| Author: | SpeedBanana1977 [ Fri Aug 23, 2019 8:19 am ] |
| Post subject: | Headers with stock manifold |
I am running Clifford shorties on a 1980 Slant with a stock intake manifold. Is there any benefit to blocking off the underside of the intake? |
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| Author: | Reed [ Fri Aug 23, 2019 9:12 am ] |
| Post subject: | Re: Headers with stock manifold |
No. In fact, there is great benefit to adding some kind of provision to heat the bottom of the intake manifold. |
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| Author: | Joshie225 [ Fri Aug 23, 2019 9:42 am ] |
| Post subject: | Re: Headers with stock manifold |
Quote: I am running Clifford shorties on a 1980 Slant with a stock intake manifold. Is there any benefit to blocking off the underside of the intake?
No, but you must block off the EGR port to avoid a vacuum leak. Also, I wouldn't use an unheated intake manifold on a daily driver. The driveability, emissions and engine life will all suffer.
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| Author: | raze38015 [ Wed Sep 25, 2019 8:25 pm ] |
| Post subject: | Re: Headers with stock manifold |
Quote: No, but you must block off the EGR port to avoid a vacuum leak. Also, I wouldn't use an unheated intake manifold on a daily driver. The driveability, emissions and engine life will all suffer.
First post here. I've currently been researching this page heavily because I have to, at minimum, replace my manifold/intake gasket and I'm curious just how much all of the above would suffer by switching to a header setup? Due to my exhaustive research that headers are the way to go if you don't want to constantly worry about a gasket blow-out and my truck is already registered as an antique vehicle here in Tennessee so I can only drive it intermittently.. It's an 85 D-100 that I acquired 3 years ago. Don't know a ton about it besides it was a one owner. I can tell some modifications have been done (distributor doesn't have a vacuum pot) but I don't know what exactly.
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| Author: | Joshie225 [ Wed Sep 25, 2019 8:38 pm ] |
| Post subject: | Re: Headers with stock manifold |
If your distributor is a Chrysler unit without a vacuum advance it also doesn't have a mechanical advance as the timing was (is) computer controlled. This is original, not aftermarket. Search the board for "Lean Burn" to read all about it. Long story short is that it's almost impossible to maintain any more and many people fit a conventional electronic distributor to trigger a GM HEI module. http://slantsix.org/forum/viewtopic.php ... discussion Headers without some kind of intake heat will shorten engine life and make the thing a pain to drive in all but the warmest weather. What's better than headers for a daily driver is a front Dutra manifold and a modified rear manifold. Making the exhaust manifold 2-piece keeps it from breaking into 2+ pieces when the manifolds are over tightened. Honestly, I would just replace the exhaust manifold and install it correctly if your manifold is cracked. They really aren't that much trouble when they're flat. https://www.rockauto.com/en/moreinfo.ph ... 85&jsn=952 |
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| Author: | SpaceFrank [ Thu Sep 26, 2019 8:57 am ] |
| Post subject: | Re: Headers with stock manifold |
I agree with Josh; the biggest cause of leaky manifold-to-head gaskets is a warped exhaust manifold. You can have your manifold planed flat by a machine shop, if it isn't cracked (maybe as much as $100, depending on location), or you can buy a new one. I'm still amazed that these are available new. If you want dual exhaust, the Dutra solution is the most reliable. |
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