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Manifold bolt sizes and grades?
https://slantsix.org/forum/viewtopic.php?t=21477
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Author:  oldgoat83 [ Wed Jan 17, 2007 2:30 pm ]
Post subject:  Manifold bolt sizes and grades?

Just verifying what I measured and have read.
For the two bolts that hold the manifolds together, I believe I need a 5/16"-18 4" Flange Bolt and Nut. For the exhaust to manifold bolts I need 1/2"-13 2" plain nut and bolt. All being of at least grade 5, but preferred grade 8 or stainless steel. Does this sound right?

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