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| Stock exhaust manifold. https://slantsix.org/forum/viewtopic.php?t=24996 |
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| Author: | straightsixer [ Wed Sep 19, 2007 9:33 am ] |
| Post subject: | Stock exhaust manifold. |
I just bought a super six setup w/ alumin intake. Are there any improvments that I can make to the stock exhaust manifold, porting ect... I hate to spend money on a header when I have really good stock manifold right here. Anyway I'm new to the board, this a great place for some great cars Thank you for your time |
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| Author: | tophat [ Wed Sep 19, 2007 6:08 pm ] |
| Post subject: | |
Gasket matching the intake and exhaust couldn't hurt. I seem to remember seeing on here something about opening the outlet to 2.25 or so. Don't forget to upgrade the rest of the exhaust too. TopHat |
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| Author: | SlantSixDan [ Wed Sep 19, 2007 8:32 pm ] |
| Post subject: | |
If you try to hone or otherwise increase the exhaust manifold outlet to 2.25", you'll bust through it. You can maybe get to 2.125", but don't push it beyond that. |
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| Author: | emsvitil [ Wed Sep 19, 2007 9:04 pm ] |
| Post subject: | |
the step up in size to an 2.25" exhaust pipe doesn't hurt anything. just get rid of casting flash, smooth out things and port match (you don't need to gasket match) Any steps from smaller to larger are ok at the head / manifold interface tooo.... |
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| Author: | BigBlockBanjo [ Thu Sep 20, 2007 1:05 pm ] |
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Quote: If you try to hone or otherwise increase the exhaust manifold outlet to 2.25", you'll bust through it. You can maybe get to 2.125", but don't push it beyond that.
Hey Dan, I bored mine out to 2.25.  It's still plenty thick, the only reason I stopped was because of the lack of sealing surface.(didn't want leaks all the time)I thought they were all that thick, maybe mine is different????? |
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| Author: | SlantSixDan [ Thu Sep 20, 2007 2:39 pm ] |
| Post subject: | |
Some are thicker than others. By the time they were offering the aluminum intake, the exhaust manifold collector area had gone from thinnish (early production) to thick (mid-production) to really thin (late "on a diet" production). And yeah, there's the sealing-surface issue to be worried about, too. |
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| Author: | straightsixer [ Thu Sep 20, 2007 6:10 pm ] |
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Thanks for your input, what about taking out the counter weight and flapper for better flow, or would make it worse? |
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| Author: | SlantSixDan [ Thu Sep 20, 2007 6:17 pm ] |
| Post subject: | |
Makes it worse, leave it in. You can choose to disable the spring so it's permanently in the "heat off" position, but I don't advise it. |
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