The opening is about an inch in diameter.
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| New engine /old manifold https://www.slantsix.org/forum/viewtopic.php?t=23603 |
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| Author: | slantfin [ Fri Jun 15, 2007 11:45 am ] |
| Post subject: | New engine /old manifold |
I have a 75 or 76 /6 and an earlier super-six manifold. I notice there is an extra manifold stud and opening at the back of the cylinder head manifold mounting surface. What is that and do I need to cover it/ bolt on some new part? |
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| Author: | slantfin [ Fri Jun 15, 2007 6:00 pm ] |
| Post subject: | |
The opening is about an inch in diameter.
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| Author: | sandy in BC [ Fri Jun 15, 2007 6:46 pm ] |
| Post subject: | |
pipe plug |
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| Author: | 72polara [ Fri Jun 15, 2007 8:46 pm ] |
| Post subject: | |
That sounds like the opening for the air injection passages. You can probably tap it and put a pipe plug in it, but I made a block-off plate and bolted that over it instead, with a stock gasket. We'll see how well that approach works in a few months. I imagine plenty of folks have done it that way before, though. |
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| Author: | SlantSixDan [ Fri Jun 15, 2007 10:11 pm ] |
| Post subject: | |
That's the air injection port you're seeing. There's a factory blockoff plate available for it, P/N 3751 249, and gasket 4275 834 (though the gasket comes with any decent-quality manifold gasket set). |
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| Author: | Charrlie_S [ Sat Jun 16, 2007 4:55 am ] |
| Post subject: | |
I just used a small "freeze out" plug, but I have no back pressure. I am running open headers. |
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